Thunder Torque Inserts 158 For Increased HP & Torque
THUNDER TORQUE INSERTS™
Increases Low & Mid Range Torque
Adjustable Sound Volume & Tone
For Your
Slip-on Mufflers & Full Exhaust Systems
MADE in The USA!
by
DK Custom Products
FEATURES & SPECS:
- High-Temp Powder Coat Finish
- Stainless Steel Studs (5/16" diameter)
- Includes All Hardware
- FITS 2" diameter & larger Slip-ons (other sizes available)
- Increases Low & Mid Range Torque
- Increased Exhaust Gas Velocity
- Increased Inertial Scavenging
- Adjustable Sound Volume & Tone
- Option for only 1 TTI for 2-1 exhaust systems
- E-Z Installation Bolts into the end of the slip-on muffler (using the baffle bolt hole)
- Patented Technology
- Made in The USA!
- Long Thread Option for Larger Diameter Exhaust SEE FITMENT NOTES Below
Watch these videos on how to get a better sound AND increase torque!
Take a listen to the following sound clips of 5 Different Bikes that all have an increased amount of Power from Thunder Torque Inserts™ Being Installed.
***The Video Below shows how to Remove Baffles from stock OEM Mufflers that do NOT have a Catalytic Converter in them. This process does NOT work on Mufflers that have Catalytic Converters in them.***
Do you want Louder Exhaust?
Quieter Exhaust?
A Deeper Tone?
A More Aggressive Bark?
Do you want More Torque?
FITMENT NOTES:
When ordering you have an option of getting just ONE TTI if you have a 2-1 exhaust system that has only One slip-on, or to choose TWO TTI's for exhausts that have Two Slip-ons.
There is an LT (long thread) Option for larger diameter pipes. Click this LINK to Order them and WATCH the Video to determine if the LT Option is appropriate for your application.
Click this LINK to see Pictures & Fitment Information, to Choose the Correct Size for your Exhaust
The Video Below shows how to Remove Baffles from stock OEM Mufflers that DO have a Catalytic Converter in them.
Another Video showing how good the stock exhaust can sound, and how much power they can have, with the baffles removed and replaced by Thunder Torque Inserts™.
All the Vance & Hines Systems and Slip-ons we've tested produce more power, and a bit deeper tone with TTI's Installed. The V&H's respond particularly well to TTI's, with or without the baffles!
Without getting too technical, we've spent thousands of hours testing shape, size, thickness, & surface coatings to find the optimum combination that increases power across a wide RPM band, AND gives maximum flexibility to deliver different sounds.
The Increase in Torque is accomplished by reducing engine pumping losses, increasing exhaust gas velocity and increasing inertial scavenging.
More about how exhaust works at this LINK
Thunder Torque Inserts™ are designed to perform well when used on slip-ons with and without baffles, drag pipes, shortys and 2-1 Systems.
The Patented design will produce a bit deeper sound/rumble all the way through the RPM and Throttle range.
If you feel that your current exhaust is too loud, the Thunder Torque Inserts™ will noticeably reduce the decibel levels.
The comparison may seem subtle but decibel measurements are not linear.
For Example, 90 decibels is four times as loud as 70 decibels and 110 decibels is about 16 times as loud.
These particular results belong to a customer that had this to say...
"My impression of the sound is that it lost some higher pitched bark at roll-on and there was a reduction in low pitch reversion "echo" (kind of a flabby chuffing sound). To my ear, with these pipes, the tone isn't significantly lower but it is a bit cleaner or more refined sounding"
(Twin Cam at Full operating temp, mixture corrected, and idling at 1000 RPM.)
A small change can make a BIG Difference!!!
THE MOST TORQUE & HORSEPOWER GAIN PER DOLLAR SPENT!!!
YOU CAN'T DO BETTER
Check out the Dyno Charts Above!
Here's what people are saying:
"I have a sportster 48 with a stage IV and VH Short Shots and feel compelled to comment as these are one of the best purchases I’ve made for the bike.
I took out the baffles and put in the TTI which took all of 30 minutes.
They make the bike better, full stop.
There’s no other way to put it. I don’t understand the physics of it and don’t want to know.
These things cost next to nothing and have been one of the best mods I’ve done to the bike." -tellawcaster
"...I was disappointed that the Cobra NH slip on muffler caused obvious loss of engine torque although the exhaust sound was much improved from stock and also SE slip on.
I did some internet research to find that exhaust lollipop baffles might help and favored DK TTI from the options I found.
I have to say I was skeptical that the TTI would make much difference but went ahead and fitted it onto the removable Cobra muffler baffle tube so the DK TTI bolt wasn’t visible outside the muffler. I was amazed at the difference this little cup close to the exhaust exit made! It definitely restored a lot of engine torque and the sound is even better.
Best $26 (including shipping) I’ve ever spent!
Thank you DK for this great product!"
DL
"We just installed the Thunder Torque Inserts. The change is very noticeable. ..using Screaming Eagle II Slipons without baffles. Metallic sound disappeared with the inserts!
...always a drop in power from 2,700 to 3,200 RPMS in any gear. Now the power delivery is very linear and smooth in the whole powerband.
It's amazing to feel that something so small, simple and easy to install made so much difference on the bike !!
Thanks so much for all!!!" -Concha
"Just wanted to take a minute and let you guys know how pleased I am with the W258 TTIs.
I'll be honest, when I first read about these things I figured it was somewhat gimicky so I didn't expect much. But, after removing the baffles from my Wild Pig slip ons and installing the W258's I was blown away by both sound and performance!
It has the potato potato sound at idle (noticeably louder than before) and also sounds great at cruising RPMs. It actually reminds me of the way my old shovel head sounded.
What really surprised me though was the very nice torque gain that you can really feel. After installing true duels and the wild pigs, I noticed a loss in torque. The TTIs brought all of that back, and maybe then some!
Best money I've spent on my exhaust system for sure. Thanks!" -Dewayne
4.9
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Top customer reviews
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Pleasantly suprised 0 people found this helpfulWith all the hype surrounding online performance mod purchases I came into these skeptical. My bike came with V & H big shots and I was nervous about removing the baffles and installing these as it required the retaining hole in the pipe to be enlarged. But I'm glad I didn't let that stand in the way. I removed the baffles which I found out were the quiet baffles. Might as well have had a banana in my tail pipes with those in. Anyways the bike sounds like a Harley should now!!!! Nice powerful rumble at idle and that growling bark when you roll the throttle. Low and mid range torque gains are more than noticeable. You can feel the bike pulling you when you roll the throttle now. I am very happy with my purchase and install was very easy. If you don't have a set of these you need to get them!!
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TTI installation 1 people found this helpfulI put the 158 TTI on my 48 with short shots and with mufflers and low end torque improved and no more back pressure. Money well spent.
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Solid product 0 people found this helpfulInstall was easy! Exhaust sounds even better. Wish I would’ve installed the Thunder Torque Insert a long time ago. Superb customer service. Customer service representative contacted me to verify that I had selected the correct insert before moving forward with my order. Loud pipes save lives!
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Looks like a good product 0 people found this helpfulI purchased my Thunder Inserts in the month of February. They arrived safe and sound in a timely manner. Because I live in the Midwest I haven't had an opportunity to try them out. I can't wait till warmer weather finally arrives.
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Thunder torque 0 people found this helpfulHaven’t installed yet. but I would like to give a big shout out to the customer service team.I ordered the wrong set.so I called customer service and they helped me get the right one fast. I would rate there team a 15 out of 10 !!! Thank you !!!!!! Very satisfied ????????????????????????????????????????????
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Big Difference 1 people found this helpfulPrevious owner removed the packing from the MK 45's on my bike which made them louder than others I have heard but more raspy and felt sluggish in low rpm's. Adding these to the baffle made them sound a lot deeper, doesn't lug like it did, and can feel a difference, not huge but enough to feel. Wife says sound carries into house more also.
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Amazing sound and super easy installation 0 people found this helpful1st, communication and shipping were great, arrived really quickly. Installation was a breeze even though I had to drill the holes to install mine. I can't attest to the performance upgrade, I don't have a dyno, but the sound is amazing and the popping that I heard on deceleration is gone. For that and that alone, more than worth the money. Icing on the cake that they are well made, the coating is great, and they look like they will last a long time, plus, made in the USA. Definitely highly recommend
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Simply effective… 0 people found this helpfulI have Vance at Heineken 4 inch “Slash” slip on with no baffles I like my pipes loud, but I could tell that I lost performance. I ran across these and gave them a try. They work excellent!!! I have recommended them to my friends who like the sound of straight pipe. I’ve got all the performance back and better. I recommend them to anybody they’re simply effective.
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Yes would recommend 0 people found this helpfulTorque inserts brought back early power after installing a stepped 2" header for upper mid range power. Order from should be more clear that there are a short and a long threaded version. A 7/8" baffle would require a long version.
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Thundercats! 1 people found this helpfulBought these to improve the sound on my Python slip-ons—bonus: noticeable torque boost in the low to mid range. Great product!
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Worth It - Even In Canada 1 people found this helpfulThese are pretty spendy with brokerage and exchange to Canada but well worth the performance and sound improvement on straight pipes. My mufflers are 2-7/8 ID and I probably would have chosen the long stalk version knowing what I know now. They don’t quite sit in the center of the pipe at that diameter.
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Great product!! 0 people found this helpfulBrought back my torque when I straight piped my bike!! Great fit and finish only complaint they're a little expensive but worth it in the end!! Thanks DK never been disappointed!!
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They work as advertised. 3 people found this helpfulI had originally installed 118's in baffles that are 2.25". I noticed a difference, but realized I could go a size larger based on information in the product description. Unbelievably, I am getting even just a little bit more out of the larger size: a little better throttle response and more felt power. It just runs better. For a relatively low cost, these devices add performance that is felt.
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Thunder torque inserts and VIED. Dialed my bike in! 1 people found this helpfulMy 13 heritage was far too lean which caused occasional stalling and was unbearably hot in traffic! Only prior mod was slip ons with louvered baffles. Installed thunder torque inserts and VIED’s. It’s a much better experience now! Heat is dramatically reduced and the torque curve is much more linear! Thanks guys! Your in depth videos are what sold me. I wouldn’t have pulled the trigger without a thorough explanation of what I was getting! Great Job!
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Work great 0 people found this helpfulI have a lot of experience on a wide array of bikes and surprised to notice a seat of the pants difference on install of my 2022 fat Bob 114. It’s subtle but definitely there and the stock V&H slip on were always a bit quiet for me so I was able to gut them 90% and have these installed for a nice healthy tone and performance benefit
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Thunder torque inserts W158 2 people found this helpfulGreat product and easy to install These guys have fast shipping even in Hawaii bought couple products from them and no disappointments.
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Thunder torque inserts 0 people found this helpfulThis is the second bike I’ve bought Thunder Torque inserts for. Very pleased with the low to midrange increase in torque, as well as a bit deeper sound.
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TTI 158 1 people found this helpfulInstalled on a 2007 Fatboy with unknown brand slip on, no baffles. Easy install as shown in several videos. Seems to have made an immediate improvement to power and Db, especially in 3rd and 4th gear. Shout out to the DK Customer Service Crew for their impeccable responses and suggestions.
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TTI Installed 1 people found this helpfulInstalled 1 5/8 TTI in Exzile Cycle monster exhaust with baffles removed. Running Thunder Max Tuner. TTI resolved decel popping and bike runs like bat out of hell!
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Works as advertised! 1 people found this helpfulI have a Tri Glide Ultra. I put on a Cobra Head Pipe with 4 inch Reinhart Slip with the baffles removed. Pretty loud but not that bad. The bike runs great. I was curious about these so I ordered a pair. After getting them and talking to customer service I had to exchange them the the long bolt one because I was putting them in the end cap of the Reinhart. Got them installed and went for a nice ride in the country through some small Iowa towns. Speed limit through most of these small towns is 35 mph or 30 mph. Before these inserts I usually shifted down to 5th or even 4th gear to obtain the speed limit. I was amazed that I could remain in 6th gear even at 30 mph. Amazing difference in low end grunt! Worth every penny. Only downside was I have about 36 dollars in shipping for a $58 part after having to exchange them out for the longer bolt version. But still a great performance upgrade for not much money!
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TTI 3 people found this helpfulI installed a set in tab muffler baffles 1” from the end of the baffle. Honestly, I couldn’t tell much difference,
Response from store
I am sorry that you have not gotten the performance that you were expecting. The kind of baffles you have play a roll in how effective the TTI's can be. If you will email our Custom Service [email protected] they can help you trouble shoot and hopefully help you get the performance you are looking for. -
2004 XL1200R w/ SE pipes 2 people found this helpfulInstalled these in my Screamin' Eagle exhausts after removing the baffles. Helped with the low/midrange throttle response. Just wish there was a 2 1/8" size, as the SE cans are 72mm ID.
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TTi 158w 0 people found this helpfulBought the inserts for my streetbob 114 2022 and I'm well impressed with them, my harley sounds how it should, I fitted them into my vance&hines big radius and love the tone and ease of fit. "I like them alot"
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They work 0 people found this helpfulPulled out the stock baffles in my Vance & Hines short shots a few years ago and replaced them with thunder torques. In runs great and sounds great. Just recently pulled out the stock baffle in my 2 into 1 Rinehart on a 103 and made a straight pipe with a single thunder torque. Made a huge difference in sound and torque. I would recommend these if your looking for great sound and torque improvements. Don't procrastinate. You won't be sorry!
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Thunder torque inserts 1 people found this helpfulSurprisingly they do just as advertise Much better pull on low end of my S&S 475 cam
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Inserti Thunder Torque 158 per maggiore potenza e coppia - Thunder Torque 158 inserts for more power and torque 0 people found this helpfulEro scettico sul funzionamento di questa diavoleria, l'ho preso perché qui in Italia non puoi circolare senza il DB killer, un modo per ingannare la polizia se ti fermano. Bene, la spinta ai bassi e medi regimi è cambiata ed il sound adesso è più cupo e potente. Translated to English: I was skeptical about the functioning of this delivery, I bought it because here in Italy you can't drive without the DB killer, a way to fool the police if they stop you. Well, the thrust at low and medium revs has changed and the sound is now darker and more powerful.
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Made a audible difference 1 people found this helpful2 years ago I primarily bought the 158s to calm the harsh sound of my Rinehart 2into1 exhaust, combined with wrapping the baffle. As seen in the picture, the 158 fits nicely, and I was able to use an existing interior hole to mount it (must pull out the baffle assembly to do this). I can't speak to any true torque gains as I haven't had it on the dyno, but it feels like it has a little more pull when hitting the throttle. Bike is a '99 Electra Glide.
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Performs as advertised! 4 people found this helpfulI used the W-158LT sized inserts, and followed the example that another person on here posted. I have a 2023 Lowrider ST with 2-2, Tab Performance slip-ons, with the 2.25 louvered baffles, and billet aluminum twist end cap. The end cap has two holes which are not used, so I drilled and tapped one the existing holes in each slip-on to a larger size to accommodate the Thunder Torque insert thread size. Additionally, I had to measure, cut and remove some of the thread length away so that once threaded into the end cap it wouldn't protrude beyond the end cap. I threaded the TTI into the modified hole and used the provided nut and lock washer to lock it into place from the inside of the cap. Next, I reinstalled the end cap, which when installed has the part of the end cap with the threaded hole completely inset in the end of the slip-on exhaust. The result: No TTI hardware to be seen from outside of the exhaust whatsoever. I can definitely tell that the bike regained lost torque from the slip-ons, and the torque increase is noticeable during acceleration at ANY speed. I also used an app to check decibel levels before and after the TTI install. Seems to be about a three decibel decrease at idle on a hot engine. Almost (but not quite) imperceptible. The deceleration cackle (which I like) is gone, but for me, it's a fair trade in order to have the previously lost torque restored. As for a change in tone or pitch? My ear can't detect the difference. Hope this helps some people.
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Excellent Modification 0 people found this helpfulOpen headers and mufflers had a decel pop that no dyno tune could correct without really overcompensating in the AFR. These inserts not only added a smooth mid range curve but they completely removed all popping during deceleration. This modification should always be added BEFORE dyno tuning in my own personal opinion. They work that well
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Great Results 0 people found this helpfulInstalled these in my 2015 Street Glide with V and H Power Duals and V and H 4.5 High Output exhaust. Very happy with the new sound and even more happy with the seat of the pants increase in felt acceleration and torque! Highly recommend installing these for additional performance for very little cost.
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158 in Tab Performance with Zombie baffles 0 people found this helpfulInstalled 158 Thunder Torgue Inserts into the end cap of Tab Performance slip ons on my 23 Low Rider ST. Drilled out and tapped one of the extra holes in the end cap. Threaded in the insert with 2 washer and the lock Tab washer. Sounds and feels a lot better. Got rid of what sounded like air sucking back into the exhaust.
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158 TT inserts on 2023 Iron 883 1 people found this helpfulSo I just added a set of Shark Road slipped to my 2022 Iron 883. Was louder than I wanted and my bike was running ragged at lower RPM. Also a noticeable loss of power down lower in torque curve. Installed the 158 tts. and immediately noticed an increase in my power, just as advertised. Problem was I had a tinny sound with the exhaust and bike was running better but still not smooth between 2300 and 3000 rpms. Also still louder than I wanted. After trying different angles to the disk with not much success, I tried turning them 180 degrees to where the cupped part was facing the engine, cone side facing out. Absolutely worked wonderfully. Power is better than stock, took the edge off the tinny sound from the pipes and decreased the volume. Also bike runs smoothly through the power band. I know this direction of installation seemed backwards to suggested position but it absolutely worked great. Am very happy with the results and would recommend to others!
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tt158 thunder torque inserts 2 people found this helpfulInstalled on Cobra RPT 3” slipons after removing baffles. Wow! Love the deep bass sound and noticeable increase in low- mid range torque. Goes great with my DK 606 air intake and external venting setup. Thanks guys!????
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Awesome little mod 2 people found this helpfulI had just installed these 158 this morning on 07 softail custom with v&h short shots it was a little bit of a job for me had to grind the bolt head for the baffles to remove them. I have them setting just about 2 inches in the pipe and turned straight like recommended took the bike on a short ride just got back the power I gained is phenomenal all through the rpms town cruising and hwy greatly improved.
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Thunder Torque 158 inserts 1 people found this helpfulFirst of all, I like to start with. They were very easy to install. I love the sound Difference of my bike A lot deeper sounds really good. I would also like to mention the customer service u. PS screwed up my order like always. And it's in Tennessee for over a week and d. K customs sent me out another set. You don't get customer service like that much anymore. I appreciate everything that you guys did. And I love your product.
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Installed thunder torque inserts 0 people found this helpfulAfter watching DK customs videos I have installed external breather,tank lift and now thunder torque inserts . Inserts awesome sound better mid range performance cooler temps
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Thunder Torques 0 people found this helpfulI put them on mainly to get rid of the decel pop. It got rid of most of it and did feel like I had a gain in low rpm torque. I would recommend them, for the price you can’t go wrong.
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Thunder Torque Inserts 2 people found this helpfulMy 07 Harley Deluxe is equipped with Samson Tru Duals Fishtails. The sound before the inserts was loud and raspy with some throttle hesitation. I was undecided whether to remove the baffles but went for it. After installing the inserts, an easy task, the sound level at idle was comparable to the sound level with baffles. The difference however was noticeable when I twisted the throttle. The RPM response was instant, the sound was a full power boost versus the raspy rattling sound. The product price and easy install is well worth it
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158 TTI 0 people found this helpfulEasy to install and seem to be working well. Pulled the baffles out and installed these in their place. I would recommend the long thread option if you have 3” pipes.
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2014 Street Glide 0 people found this helpfulI order these for my bike and it shipped quick. Install was pretty easy and the sound after the install was even better. I have the 4" rineharts and they sound better.
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Pleasantly Surprised 2 people found this helpfulThe bike I installed these TTIs on is a 2014 Electra Glide Ultra Limited 103ci TC. The bike is stock, with 74K miles at the time of the install. No cams, throttle body, displacement upgrade, etc. I have installed an oil breather bybass, and 4" Rhinehart slip-ons. The headers are stock. Just before installing the TTIs, I had surgically removed the California mandated leg warmer, after which I went for a long ride. The Catalectomy resulted in HUGE performance gains above about 3200RPMs. I know this is a contentious issue, and I won't argue my case here on that. All I know is that I regret not removing that little piece of platinum coated tree hugging socialism three years ago. The down side was that the motor did not respond well at lower RPMs, idle through 3k. With the stock cam, the throttle had never been snappy, but it really idled and rolled up noticeably worse after the header surgery. This is REVERSION my friends, it IS a thing. I installed the DK Customs TTIs and they completely SOLVED the issue. In my case, my slip-ons did not have any packing in them when I bought them, used. I was able to remove the baffles and install the TTIs directly to the baffles instead of boring a larger hole on the outside of the exhaust. This allowed me to hide the hardware and provided a cleaner look overall. My experience is that the TTIs absolutely do what they claim and have been completely worth installing. Someday soon I will do the whole camchest and 110ci upgrade thing, but for now I can honestly say that the changes I have described above have given me the best of both worlds. Low end torque, and top end flow. If you have taken steps to increase flow in your exhaust, I highly recommend installing the TTIs to get the most out of your system. As far as the sound, I would say that the exhaust is not as "raw" after the TTI install, but they are still plenty loud. I have no regrets regarding the sound at all. If you are on the fence, get down and order a set of these. Period.
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Best solution to reversion 0 people found this helpfulInstalled these on my 2001 Hugger Sportster chopper build. My exhausts are Screaming Eagle II slash cut duals, these already jab a straight through baffle but the higher pitched sound and RPM loss was noticeable. With the W158 Thunder Torque Inserts after removing the baffles its sound has changed to a much lower rumble and the reversion has stopped. Installation was as expected but the holes had to be widened slightly from 5/16 to 3/8 inches which was just a step up. Since these exhausts were on the bike from the previous owner I was unaware that this version wasn’t intended for street use and upon removing them found them labeled for closed track only. I elected not to replace them but kept them for my chopper build and with the DK inserts installed it sounds very rich. Overall I’m pleased with the results and recommend this product with a five star rating.
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They work exactly as advertised 0 people found this helpfulI had the stock mufflers on my Fat Boy, modified. They sounded great but I could feel the lost low-end torque. The Thunder Torque inserts brought that torque back and the mufflers still sound great. Bottom line? They work as advertized.
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Everything That I Had Hoped For 0 people found this helpfulI installed these on a 2020 XL1200CX Sportster Roadster. The bike has a HD Stage 1 air cleaner and Cobra RPT Pipes. It was tuned at the dealer with the HD tuner. From day one there have been decel pops at almost all RPMs but especially 2800-3000. The Thunder Torque inserts totally eliminated the decel pops. The exhaust note is slightly quieter and deeper. My seat of the pants dyno tells me there is more torque in the 2200 - 3000 rpm range. These inserts work!
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Torque insert 158 0 people found this helpfulHard to believe but exactly as advertised. 1994 heritage softail, baffles removed. The bike sounds a hell of lot better and low, mid-range torque is so much better. Thanks for the product and great videos with data to back up the claims!
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PROBLEM SOLVED 0 people found this helpfulWe had a 2006 Honda Shadow Sabre with a mishmash exhaust system. We installed the correct jets but the bike continued to after fire excessively. Added the thunder torque inserts and the after fire went away. The bike sounds fantastic now. and the owner is very pleased with the result
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Loud Pipes Saves Lifes 0 people found this helpfulSimple installation. I have the V/H Shortshots and had removed the baffles. Also running the V/H intake. Thunderous!! I have not had a chance to feel the difference as I’m waiting on some jets. However the bike sounds completely different. 03 Sportster 1200C.
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"Must Have" mod 0 people found this helpfulAdding these to your slip-ons is a no-brainer. Just do it.
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Instant difference 0 people found this helpfulAfter sitting in my garage for nearly 6 months, I decided to install these . Big difference instantly . Very well done DK customs . And the price point can’t be beat .
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good sound 0 people found this helpfuleasy install, good barky sound, hard to tell if tourqey increase thru butt dyno. so far, satisfied with the product
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Great Customer Service - Long Thread Inserts 158 1 people found this helpfulOriginally ordered the Standard Thread Thunder Torque Inserts 158 for my 2020 Low Rider S with Tab Z slip-ons and found the thread length was too short. Was called by customer service because of my review and informed me of the Long Thread Thunder Torque Inserts 158. They offered to do an exchange with no issues. It was my fault I did not see the Long Thread option. Love D K Products!
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Sound 1 people found this helpfulI love the way it made my Vance &Hines double slash sound. Very happy with my purchase. I have good low end torque coupled with some 525 Reaper cams.
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surprised 1 people found this helpfulsorry it took so long to get this review in, had to wait for the ice to melt.i knew it would help but i didn't think it would make such a difference.
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Great Product - Great Results 1 people found this helpfulI had read about reversion and what it is so was interested to read and hear about DK Customs' explanation and videos, backed up by dyno charts, on the Thunder Torque Inserts. I admit that I was a little skeptical at first that at <$50 these would work. However, convinced by their articles, I went ahead and bought a set of TTI-158's and fitted them to a set of V&H Staggered Shortshots, the result was, frankly, amazing! You can, literally feel an improvement in lower end torque especially when opening up out of a bend. Absolutely fantastic product. Well done Guys - big thumbs up from me.
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Same results as adding a cam or 2-1 pipe 0 people found this helpfulIt’s really hard to believe unless you experience it for yourself but the difference these things make is equal to putting a larger cam or changing drag pipes to a good 2-1 pipe, I have experienced both. This thing really works. I have 3 different Harleys and all 3 have one!
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Good quality product 0 people found this helpfulAfter lots of research and reading reviews I finally purchased the inserts. I installed the 158's in a set of Rinehart slip-ons with baffles. The installation was easy once I got the end caps off! Not sure if there has been any improvement in torque since I am still running stock air cleaners and head pipes with cat but it sure sounds good!
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Amazing results 0 people found this helpfulI heard about these from a person I met in HD shop. Watched videos and was extremely skeptical of performance results but wanted the sound. Bought first one and put on 03 fat boy, Stage 4. I really liked the sound and noticed a slight performance increase. Then I bought one for my 2019 heritage, both have 2-1 Rinehart pipes. Stage 2 with FP3. If the reading on the tuner can be believed I gained 15 hp 17 tq. I definitely noticed in seat of my pants. Never own another bike that won’t have one of these. Great job DK.
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Awesome MOD investment for real TORQUE increases!! 0 people found this helpfulI installed these Thunder TORQUES insert on my 2019 Harley Heritage 107 stage 3 kit w/D&D FAT CAT exhaust!! Holy Thunder, I could really feel the increase of torque an little better throttle response !! This should be one of the very first mods people should do to there bikes if desired better performance
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Amazing Thunder Torque Success 0 people found this helpfulO.K., I finally installed Thunder Torque Inserts the way Kevin said to do it. I ordered the bigger 158s and removed my baffles this time. The results? Totally awesome. I don't get any popping in the headers now. Taking out the baffles and running 158's is the key. The sound level ain't bad either. I thought my 2006 CVO FatBoy 103 would be too loud but it's really just a little louder. Now my bike can breath better, sounds better and it has outstanding pick-up. And I can run my Power Vision tuner without any popping.
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Best mod for the money 0 people found this helpfulI installed the Thunder torque on my 2019 heritage 107 stage 3 with Cobra Speedster / down pipes!! It really made a big noticeable difference in my torque throttle response and in the mid-range!! I would have been looking at him for last few years but just couldn't understand how these simple mods could actually work but doing the research and watching the videos and customer reviews and for the price I couldn't go wrong!! I just wish I would install these a long time ago in extremely worth the money and if you love torque it's the only way to go! And if I get other bikes in the future I definitely will buy them
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WOW 0 people found this helpfulFor the last few years I've been looking at the Thunder torque but was hesitant to buy it because it's just didn't seem like it would really work
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Impressed 0 people found this helpfulI wasn't chasing torque or horsepower but trying to correct a severe case of reversion when I installed Cobra True Dual head pipes replacing my stock exhaust on my 21 Street Glide. I installed the headers and mounted my Rinehart DBX45's back on and after tuning with my Power Vision 4, anytime I shifted gears or decelerated the engine it sounded like a 1975 Peterbilt cranking on the jake brake. After trying other tuning options and reaching out to Cobra (no help by the way) I emailed Dwayne who explained what my problem was. So after researching the online talking heads, I bought a set of the TTI 158's and installed them today. To be perfectly honest the reversion hasn't disappeared totally but wow, the difference was amazing. Not sure of any HP/Torque gains as that's to be proven by the Dyno. I will say that I'm happy to have gone this route rather than shelling out big bucks for new baffles, slip-ons, head pipes, or even a new tuner. Thanks Dwayne
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Great value and service 0 people found this helpfulOn a 2007 Sportster Custom, using the 118 TTI with the standard baffle and wish I'd done this much earlier. These guys provide great info on how to do it all and were very prompt and helpful in answering a specific email query. Highly recommend the product and the company.
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Low end torque is much improved 0 people found this helpfulInstalled on a 2018 Heritage Classic 114 with Reinhart slip-ons. Torque at the low end is way better than it was. The sound is throatier and deeper on acceleration but I don't really care for the sound on deceleration. I turned the inserts slightly and some of the deceleration "frapping" as I call it went away but some is still there. Bottom line is I like the torque improvement but not all of the sound quality. Just a personal thing I guess. These inserts do work and they are not very hard to install. Great quality product.
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works 0 people found this helpfulworked as advertised 0n 1200 sportster with gutted mufflers
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Great product 0 people found this helpfulI added the Thunder Torque Inserts to my 2016 tri glide and it made a great difference in the quality of the sound. Also, improved the low end torque.
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Seeing and hearing is believing 0 people found this helpfulBased on past experience of buying another bike with straight pipes and replacing the ends with baffled slip-ons that eliminated the reversion, I already knew what was ahead, but wasn't sure the TTIs could do the same - and they do! At a fraction of the cost, I got low end torque added to this new-to-me bike I had never experienced since I have had it - and the deeper sound makes these slip-ons the makers weren't even proud enough to put a name on - sound good!
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I'd recommend Thunder Torque Inserts 0 people found this helpfulI installed the Thunder Torque Inserts in my strait pipes on my '07 Sportster Roadster and I was surprised at how much better my engine ran. I'm not a tech guy so I don't know what Dynos prove, I just know that these work and they work well. I would recommend them to anyone with straight pipes.
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Worth the investment 0 people found this helpfulPurchased the 158 TTIs for my 2021 Heritage Classic with V&H slip-ons. Noticed improvement with sound and torque in 1st couple of gears. Easy to install even with my limited mechanical background. Well worth the inexpensive price.
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What I needed 0 people found this helpfulAfter doing my Stage 2 upgrade I couldn’t get rid of the deceleration popping. So after doing some research on reversion I decided to give these a try. They’re just a modern day version of the “lollipop”. But much better quality than I could have done. So my laziness comes at a price. But I did instantly notice that the popping was gone. Inserting them on the bike is difficult with the exhaust installed because of clearance issues. But all in all I’m very satisfied with the results.
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Surprising Results! 2 people found this helpfulPurchased the 158 TTI's to install on my 2009 Road King with Freedom Performance True Duals exhaust. Noticed the increase in torque but the real benefit I wasn't expecting was the increase in mpg! These increased my mpg by appx 5mpg across the board. Don't know the science behind it, but at the price of gas these days, more than worth the price!!!
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GREAT ADD-ON 0 people found this helpfulfor the price, you can't beat the performance. And the sound. i would pay double for this. super easy to put on !!!
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Impressed 1 people found this helpfulI was running screaming eagle slip ons and intake. I was not making the horsepower I wanted even with the DK intake. So I cut out the stock mufflers and put them back on. Horrible. They sounded loud but i got a bad reversion at 3500 rpm. Those mufflers are 3" without the baffles. So i got the mid sized thundertorqe insert. Reversion solved? Pretty much but the bike was still way too loud. So i stepped up to the biggest ones. They're inexpensive why not? Big improvement in sound and torque. I've played with the angles a little and had to let my Thundermax adjust to them but I've gotten more power, torque and mpg. I'm planning on a 1275 upgrade with cams and a 2 into 1. Thundertorqe will be in those pipes too.
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Worth it at triple the price 2 people found this helpfulSound is so much better, throttle response has improved and most importantly on decel all of the popping and farting is gone! Pulls hard, smooth and predictably and has a great sound. My V&H pipes have little to no baffling and sounded harsh. Now they sound great and is not nearly so obnoxious so my neighbours I am sure appreciate it. Easy to install with basic tools and for the money a great mod.
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Best Bang for the Buck 0 people found this helpfulI added these to my Rinehart slip ons after taking the exhaust caps off. There is a noticeable slight increase in torque, and a smoothing out of the first two gears when accelerating on my Iron 883. Great product!
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Excellent 0 people found this helpfulThey work great in restoring low end power on my 2021 street bob with aftermarket non-baffeled exhaust tips
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Good results 0 people found this helpfulGuys, I am very pleased with your product. The sound is excellent and the seat of the pants power felt better. Thanks for the fast delivery.
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Way better than I expected!! 0 people found this helpful2019 Fatboy 114 Freedom Performance Cobat shorty pipe. Definitely improved low end torque and the sound is just incredible!!
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Awesome 0 people found this helpful2008 Heritage Class with V&H Straightshots. Definitely made a noticeable difference in the low range rpms and gave it a throatier growl. Very happy!
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Amazing Mod! Worth every penny! 0 people found this helpfulJust installed the Thunder Torque Insert on my 17 Softail Slim S with V & H Competition Pro Pipe. I have to say I can definitely feel the increased torque through the mid range power of my Slim. It had a very good sound before, a little on the loud side, but now it has a little more thump to it which I think sounds even better. It’s still loud and obnoxious, but that’s what I like! I love your videos and products and look forward watching new ones and adding new products to my bike. Thanks DK Customs and Keep up the good work! Best Regards SLeonard
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Superb! 0 people found this helpfulI was quite disappointed when I installed my new Rineharts on my 124" milwaukee 8 bagger. I've always run Rinehart mufflers because they make a harley sound like a harley should sound. Not only did they not sound great, but the torque at low rpm was boring. Tech support at dk customs convinced me that these inserts could be a game changer and they were right! The torque came back, and the sound is better than any set of Rineharts I've ever had! These little magic-makers will be on every bike I own from now on!
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Like 'em 0 people found this helpfulI have them on my V&H 300 Eliminator slip ons and like them. They do make my ride sound better and I felt that extra pull and better responsiveness in the low and mid range RPMs. I hardly ever ride above 4K RPMs so I can't tell you how they do in the higher RPMs. I played with the angles of the 158 TTIs and found the best fit was at a 60 degree offset from open face being flush with exhaust exit. Having it flush with exit was too restrictive as it covered most of the exit (2'' exit). Perhaps the smaller version would have worked well flush with exit but I'm happy with what I have now. Thanks again DK Customs!
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Exactly as described 0 people found this helpfulGot a set of TTI's for my V&H Twin Slash slip ons. Great tone, torque, and helped with decel pop! Easy install.
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Great exhaust note 0 people found this helpfulInstalled these straight on during my 124" build. So, I can't speak to how they'd compare to my previous set up. Figured I'd add the TTI's during the build since I know my 2-2 sans crossover would drain my torque. I was noticeably impressed however, by their low end rumble, and have not noticed the low end lacking. Again, hard to objectively compare though. I'd definitely add recommend the product.
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TTi's 1 people found this helpfulI bought these with the hope of taking the baffles out and having a louder deeper sound. After removing the baffles from my slip ons and installing the TTi's, i was really pleased with the sound at idle which was quite loud. To my surprise, I didn't experience low to mid range torque loss and they seemed to work really well. The down side was that while riding and listening to the exhaust it really sounded like shit and was too loud so I put the baffles back in with the TTi's. I am still impressed with the noticeable improvement in low and mid range torque. It truly feels more responsive and smoother accelerating. Another great product from DK!
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They work 0 people found this helpfulI have a Dyna twin cam 96 with an S&S air cleaner, breather bypass and Vance and Hines Big Shots full exhaust system. These pipes are LOUD and had a good amount of decel pop. Installed the TTI’s and instantly had more bottom end torque, less decel pop and made it sound deeper and less harsh. I will definitely put these in any exhaust I buy in the future.
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Performs exactly as I hoped for 0 people found this helpfulI've spent more money on bigger claims and been less than impressed. Not at all the case with the thunder torque inserts! This product works very well. Gave my Rinehart slip ons a deeper tone and I noticed a substantial increase in torque. I ride my street bob a whole lot and I'm very familiar with it so when I say I noticed an increase in torque it's for real! Great customer service. Very friendly, helpful and down to earth people at DK Customs. You've earned a customer here.
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noticable torque increase deeper & lower tone 0 people found this helpfulI was skeptical at first and probably wouldn't have tried it if it wasn't from DK The science behind the product doesn't lie, I was amazed at the difference in acceleration I set mine at a slight angle (158 in a 3&1/2 " Rinehart slip on) Small price tag on a great product !!
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Amazing product 0 people found this helpfulI have V&H 4 1/2 H/O slip ons. I researched the TTI’s everywhere I could, even called dk customs to ask questions and make sure I got the right ones and right placement. I took the fiberglass packing out and installed the TTI’s as instructed. I love the sound and the low and mid range torque is unbelievable! Would highly recommend these. Customer service is the best! Thank you dk!
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great 0 people found this helpfulafter doing a lot of research i went with two 158. easy to install sound great , and i can feel the the deafferents in low and mid, all the way through . the bike pulls harder. went on first run 125 miles and i was surprised , also got better gas mileage. 2000 fxst standard with cv carb(worked over) s&s open air system V&h long shot style No Baffles . Bottom line I like them . thanks DK Smokey.
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158 thunder torgue 0 people found this helpfulThe 158 was just what I was looking for after installing the Woods tw222 cams in my street glide 103. Did for sure get that tw222 reversion coming thru throttle body... but let me tell ya... pulls hard at 2800-4800 rpm thru all gears. The 158 thunder torque took a lot of the reversion out... and could tell more torgue on low end . The install was fine and looks and sounds great. Love my low rumble with the 158 thunder torgue.
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These things work 0 people found this helpfulI went into this skeptical. I ordered a set of V&H slip ons at the same time as these inserts just in case they didn't work as advertised. I can happily say after a few weeks with drilled baffles and TTI's that I returned the V&H pipes without even trying them. The stock muffler with TTIs is the EXACT right Harley sound I wanted. Not too loud, but definitely got the V-Twin thump.
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2015 1200 0 people found this helpfulBest my bike has sounded and performed since I have owned it. Make sure you mount solid and near the center of your exhaust flow. I have factory exhaust, wrapped with factory covers over wrap. Completely gutted wrapped factory mufflers. These inserts took away most of the deceleration pop. And gave me all the torque I was missing. Amazing sound note!! I recommend to anyone who loves open pipes but wants the power of a tuned exhaust.
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Amazing 0 people found this helpfulWho knew how that two pieces of metal would make such a huge difference. These are amazing, lower tone on idle but when I open the throttle the sound comes alive as does the added torque. DK customs comes through again, huge win!!!
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Did exactly what I needed them to do 0 people found this helpfulI had a issue with low speed surging I installed the torque tuners and it cured the problem and really didn't affect the sound that I wanted very well made and fairly easy to install
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Great Product !!! \m/ 0 people found this helpfulFit perfectly. Easy to install. Love the sound afterwards. DK Videos are great to cover all my questions and explain the benefits. DK customer service is second to none. Installed on a 2015 Iron 883
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Love the sound of the low end 0 people found this helpfulI've a 2020 Slim, watched a lot of you tube videos, deciphered the B.S. and I paid attention to DK, and I made a decision, my new bike running like it should or the awesome warranty. I first installed a way bigger breather, hmm. Than immediately rerouted the hot vapor through DK banjo fittings, via a brass T, hidden behind the air cleaner, to a breather mounted under the bike. I watched and understand back pressure and I bought a off brand (2) slip ons, also installed the DK Torque inserts. My 107, woke up, you can hear the air being sucked in, real low rumble behind the bike, and I can still hear her talk. Thanks DK
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Great Product 0 people found this helpfulFit perfectly and easy to install. The price was right on these, so I figured why not give them a try? Deceleration pop was gone instantly on the first ride. Noticed an improvement on throttle response and seems a bit torque-ier. Exhaust also sounds deeper than before. Overall I'm impressed, happy with the purchase and DK's customer service is second to none. Installed on 2007 Sportster 1200 XLC with 2.5" Python slip-ons.
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Actually an improvement! 0 people found this helpfulInstalled 158's on my Iron883 with VH Short Shots and was pleasantly surprised. Deeper exhaust tone and a little improvement in the mid to high range especially in a role on. Worth the small price for sure.
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07 FXD V&H Short shots 0 people found this helpfulSo I'm writing a unbias review. I had my bike Dynoed after a stage 2 using a Fueling Reaper 543 cam and my bike felt great, responsive, quick and sounded great with a stock 96 Cubic Inch motor. After hearing about the TTI's I decided to order them and give it a try to see if it really does what it claims to do. At first glance after receiving my 158 TTI's it looks like a great quality product. I had to modify it though by shaving the nut down to half it's size and trim the bolt down to fit under the V&H short shots heat shield which now sits snug hard up against it though the baffle holes and had to drill a bigger hole in the existing baffle holes to fit the bolt. After riding it seemed to have more torque and a little more responsive in the lower RPM range but it took a big hit in the higher RPM range where before it was pulling right up until redline. I guess you can't have best of both. I also did remove the louvered baffles that V&H engineered for performance that the short shots came standard with so that seemed to work for the higher RPM ranges. The TTI's does sound great though a more deeper tone and I do get compliments by my mates on how my bike does sound. I guess it all depends what style you ride if you like the power in the higher RPM's or lower to make your decision on getting the TTI'S but for the price was worth a try and can always change it back to the way it was if I decided to drag lol.
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great! 0 people found this helpfulThey tune better than my homemade lollipops,
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They work plain and simple 0 people found this helpfulI have 2019 Fatboy 114 stage 2 tq cam Freedom 2-1 combat shorty turnouts. The pipes sound amazing, didn’t know if installing these thunder torques would do anything at all. The baffles stayed in but since the pipes are short I guessed I could benefit from a little more back pressure... what could I lose but $30? They freaking work noticeable difference in low end power. And a bad ass growl to deceleration... it also eliminated an occasional decel pop.... honest review this little insert just works. Good job DK !!!
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TTI 158 0 people found this helpfulPut these in as a winter project and also packed my baffles which had none and were a straight through design. Aside from a deeper tone from the packing the one thing I noticed was decel pop was greatly reduced to almost none existent. I haven't ridden since last October so I don't have a before and after comparison but so far I am happy with them.
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TTI 158's 1 people found this helpfulBought my 2016 883 with a 1250 hammer kit on it.bike had 980 miles on it.bike was very torquey and fast.bike also came with cobra 909 speedster exhaust on it upon purchase of the bike,it was a little too quiet for my taste so i took the welded in flat washer out of both baffles and lost just a little torque but not enough to matter.. this gave me the sound i was looking for.then i upgraded my belt sprockets to 32/66 for lower rpms on the interstate.lost a little more torque but bike still had good power.... so kevin asked me if i wanted to try the 158,s as my pipe diameter is right at 2"...got them in after,drilling baffle,pipe,and heat shield in the original spot where they all connected.. so glad i did because now i have all the torque back that i lost from higher gearing and modified baffle with almost the same loudness except deeper now... if i had to buy the cobra 909 speedster exhaust again,i would do the exact same thing to the baffles and install the 158,s...its like a whole new bike except with interstate gearing.in conjuction with the oil filter relocation kit,my oil and head temps are now running lower.these guys really know their stuff when it comes to bikes.Thx a bunch kevin for all the help.LOVE your products !
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Great product 0 people found this helpfulThe inserts are made very well, easy to install, bike runs good and sounds great. Installed on j103 with Vance Hines, straight shots baffle removed
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Fan for life 0 people found this helpfulBeen riding 40 years best damn thing I ever bought. Added that to my new drag pipes laf s and added a new breather unbelievable difference best and 40 years. Great product. Don't hesitate.
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17 Slim S V&H Short Shots 0 people found this helpfulHey DK family. I have a 2017 Slim S with V&H Short Shots. I installed your Thunder Torques and O...M...Gosh !!!!!!!!!!!! Very thunderous over the the V&H baffles. It has this deep snap/clap sound. Hard to explain. lol. I feel a nice bump in power. When I get her dyno tuned I'm sure I'll see more of an overall gain when the A/Fs and timing is smoother. To future buyers, Be sure when installing these in any pipe with heat shields that you mock up where you need to drill holes as to not interfere with heat shields and exhaust mounting brackets. A sharpy will the trick. I was careful of this and I also made sure you can not see the bolts. I positioned the baffles in the middle of the inner pipe diameter so they would look centered. I did not cover the V&H stock baffles mounting holes. It doesn't hinder anything imo. I LOVE THE SOUND of these baffles. I was going to get a set of BCTs as I have had them (bct's) in the past. GET THE DK TTi's. YOU WILL SAVE MONEY AND THE SOUND IS BETTER imo and the power seems stronger. Like it pulls harder the BCTs did . That's my opinion with no dyno to back it up. Thanks DK team for yet another excellently engineered product. God Bless and keep the shiny side UP!!!! I got the 158s. Perfect fit for the V&Hs.
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Great product, easy install! 0 people found this helpfulWhen I installed Magnaflow 4-1/2” slipons on my 2014 Road King I was shocked at the severe loss of low end torque. Jamie at Fuel Moto recommended I install TTI’S, glad I did torque greatly improved and sound was better. Some written instructions would be helpful.
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Thunder Torque Inserts 0 people found this helpfulAdded the TTI 158 to my '17 Slim with Freedom Performance Radical Radius pipes. Wish I hadn't waited so long. Night and day difference. Sound is deeper, bike pulls hard. Great product!
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Sounds great 0 people found this helpfulSounds great easy installation.all the stuff I get here is endeared to high quality better than HD stuff.
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TT inserts and LED drop in headlight bulbs 0 people found this helpfulFirst off, thank you guys at DKcustom products for the excellent follow through and communication. I really appreciate all the email replays to my questions. The drop in LED bulbs were a snap to put in and made a world of difference in the dark mornings on the way to work!! They make it easier to see and be seen.
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Thunder Torque Inserts 0 people found this helpfulI just put these in my Cobra 909 slipons! Great product, added the back pressure that my M8 needed so torque is back the way it was when I first bought the bike. Didn't do a whole lot for sound, but, it sure put the low end torque back the way I wanted. Super product!
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Just the ticket! 0 people found this helpfulI put these on the ends of my 3 inch aftermarket exhaust on my SRT Jeep. it changed an obnoxious idle to a nice deep rumble.
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Great 0 people found this helpfulThey are exceptional, that simple. Just put a set in my fishtails on an 02 road king And my bikes running better now than it ever has. Running true duals with fish tails Screamin eagle intake and power commander v and didn’t need to retune upon installing
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Great product 0 people found this helpfulI do a lot of research before I buy and the Thunder Torque insert made sense. I recently rode !800 miles in two days and my exhaust sound was unbearable plus my bike had poor low end torque . I ordered the baffle and noticed a really good boost right off idle to mid range that I had been missing. The sound is better as well and that bad bark is much quieter yet sounds good. I'm really impressed with this product and the help and assistance I received when I called DK.
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Best $$$ spent for performance increase. 0 people found this helpfulI've known about these for a while. I honestly thought it was a bunch of snake oil and BS about the performance increase. Recently, on my 2011 Blackline Softail (96 ci, stage 1, fp3 tuner, V&H slip on pipes, SE breather), I've noticed a flat spot in the torque around 2500-3000 rpm. It's like the bike would lolligag through those rpms and grab at 3K and run out hard from there. This was driving me nuts because I do a lot of backroads riding in 3rd & 4th gears in that rpm range. I've run multiple auto-tune sessions on my fp3 and I still had that flat spot in my torque range. So I figured, why not try these. For the price, I ain't gonna loose that much if they're just hype and do nothing for me. Put them on Saturday evening (left the stock baffles in ) and took the bike out for a rip on Sunday morning. WHAT A DIFFERENCE!!!! I couldn't believe how hard my bike was now pulling from 1800 rpms all the way through 5000. I'm sold on these and have already told several of my friends who have similar torque related complaints to get these!
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Amazing 0 people found this helpfulAdded the 158s to my 05 sporty 1200 with a stage 1 and it really woke it up! My main goal was to deepen the sound so I didn't piss off my neighbors leaving for work at 5:30am. Best $30 I've spent on the bike yet. Noticable change in low and mid range torque and a better sound. Super fast shipping too.
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You wont be disappointed 0 people found this helpfulEverybody I ride with has complimented the sound of my bike. It also runs so much better than when I ran no baffles. Best money I've spent on my bike so far.
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Excellent 0 people found this helpfulAwesome product works as advertised! Customer service was great to deal with. Will by from DK Customs again for sure. Thank you for the great products and service.
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Improved sound & performance 0 people found this helpfulPut these on true dual system. Butt dyno felt improved torque and deeper tone (which is what I was looking for). For the price, actually bought 2 sizes to try with hi-flow baffle and the larger to try with baffles removed.
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Thunder Torque Inserts 158 0 people found this helpfulI put these in my Vance and Hines big radius pipes on my 110 motor. Honestly WOW! The 110 has a lot of torque but these bad boys brought out even more!!!! Thanks DK CUSTOMS!!! AWESOME QUALITY PRODUCT AND CUSTOMER SERVICE!!!!
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Good Little Pieces of Metal 0 people found this helpfulNice product and good business move on DK. The best products for customers aren’t any new inventions, but ideas to better or innovate existing ones. By starting with the classic lollipop design and perfecting a patent with a wavy & curved plate welded on a screw thread, DK really hit it out of the park. I have had DIY lollipops in for years as I don’t like baffled sounding exhaust. Once I purchased and installed these on my 48, it became apparent that the sound you can make is really up to you more so than conventional lollipops. I do like the ability the TTI’s give us to tweak the decibels and growl of the exhaust. That’s what I am really happy about. I have noticed a tad more Torque and power but that may be all in my head as I do not own a DYNO. Plus, as we all know 48’s are light bikes (not heavy) with a 1200 engine, so they are already “torqy” throughout the RPM scale. What I do recommend is running auto tune if you have an FP3 for a couple sessions - only after you find the sound you like to get your airflow synced up. Overall, it’s an out of sight mod that is affordable and adds another way to make your bike “your own bike” Definitely Recommend.
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Very pleased with the product 0 people found this helpfulGot them for my nightster with short shots. Very happy with the results. Loud and more torque. Shipped in 3 days after ordering and customer service was amazing.
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Best bang for the buck! 0 people found this helpfulTTI are exactly what they're described to be. I put these in my screamin eagle II's after removing the baffles and didn't lose any power and it sounds badass! If anything i gained tourqe at low end and through the middle. Definitely a good product and it shipped fast.
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Awesome product 0 people found this helpfulI recently installed the TTI 158's on my 2013 Wide Glide with Vance and Hines Mini Grenades without baffles. The sound is very good. Some would say loud! I like loud, so I'm satisfied. I haven't dynoed it, but I can definitely feel the performance. Also there is no drone at highway speeds. I also feel that the roll on torque is there also. I have the 118' s and the 258' s for other bikes I have. The Wide Glide has the 636 air cleaner as well. The install was easy. Very good value for the price. I'm very happy with the product and the customer service.
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torque insert 0 people found this helpfulsounds great
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158 torque insert 0 people found this helpfulPut the inserts in my 2 1/4" drag pipes on my 02 Springer Custom and they sound amazing, and performance is great. They are built well, and between the manufacturer website and the YouTube videos all questions will be answered. Super Satisfied.
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More torque please! 0 people found this helpfulExcellent craftsmanship, sound and torque increase. Thank you!
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Freakin Amazing 0 people found this helpfulI bought a set and easy install. WOW they are not Bull Sh**ing they really work. I told a friend and he also experienced getting back the lost power from baffle removal. i swear by them.
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I'm happy 0 people found this helpfulMy seat-of-the-pants dyno says my bike has more power and feels like it is pulling better in the lower gears. Can't say sound is louder but my Magnaflow 4.5 Hitmans seem to sound different with a little more rumble. I did have a little dificulty installing the TTI's as the threaded part was too shour to fit through the thick sidewall of my mufflers. Had to improvise with a piece of a coupling nut and a 2" long stud, but I got them installed. Even with this little difficulty, the benefits for the price is worth it. Yep, I'm happy.
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As Advertised 0 people found this helpfulBought my Low Rider used with tapered slip-ons, no baffles. It was evident, especially in the mid-RPM range that there were issues with exhaust flow. I was skeptical about the TTI claims, but the low-cost translated to low risk. Once installed, there was noticeable improvement in acceleration, eliminating the "bogging" at certain RPMs. While that was the intent of trying the TTIs, I was also pleased with the sound improvement: deepened the tone and removed a higher-frequency "pinging" overtone previously present with the open pipes. Seems to have brought the exhaust flow back into line with the original ECM set-up on the bike. Pleasantly surprised that such a simple product had such a noticeable impact on both the performance and sound.
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Another 5 star review 0 people found this helpfulI don’t know what more could be said - but there’s a reason for all these 5 star reviews. I was running a straight exhaust no baffles on my Nightster through V&H sideshots - good and loud - but was losing some torque and back pressure. Installed these bad Larry’s and it was like a new exhaust. Sounded deeper, more boom to it, and still just as loud as before. Definitely added power to it as well. I will definitely buy these for my next bike.
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2 -1 Short Side Dump Exhaust 0 people found this helpfulWas getting ready to spend $1500 on a new exhaust and decided to try the TTI. The bike ran fine at wide open throttle but was not enjoyable to ride around town. After the install I had a completely different bike. Gobs of low end torque, smoother through at all RPMs and made the exhaust note more tolerable. Best $26.00 ever spent. Thanks DK for savings me thousands.
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Great product for my Cobras slip ons ! 1 people found this helpfulI am living in France and driving a 2018 1200 Iron sportster. I bought a pair of Cobras RPT slip ons and found them a bit too loud but worse, I found I lost some torque. They are a part of my stage 1 : kuryakyn velociraptor A/C and Dynojet Power Vision tune. Then, with the advice of a friend of mine and another one from DK Customs, I bought a set of W158 TTIs. I installed them instead of the baffle bolt. I kept the genuine baffle inside the slip ons. What a great improvement ! I got a great deep sound, less loud and best of all, I had the lost torque back, especially in low and mid range without loosing any power in high range. It is just the right solution to keep my Cobras slip ons on my bike without being afraid of getting a fine for a too big noise. More than this, I can ride the entire day without loosing my ear capability ! Last thing : price is ridiculous regarding what TTIs give !
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Great product! 0 people found this helpfulI bought a used 2004 Sportster that the P.O. had drilled the baffles out of. It was too loud and sounded like the rim shot on a cheap snare drum! Very annoying. I figured I couldn't go wrong for the price. I installed these while the mufflers were still on the bike, a good punch is key.... I found the tone and the sharpness of my old exhaust gone, only too be replaced by a slightly quieter and glorious exhaust note. My seat of the pants Dyno is getting old and doesn't work so well anymore, but the sound of my Sporty sure puts a grin on my face. Well done!
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Wow 0 people found this helpfulI have 07 sportster with efi put hi flow ac end rinehart mufflers. Bike stumbled and bucked at low speed and rpms. Tried a bunch of things then saw these and another version. The other version seemed too expensive for what they were. I'm soooooo glad I chose these. Kept baffles and added thunder torque inserts and bam bike actually can cruise through town and not look like I'm trying to bull ride! Best money I spent on the bike. Sounds like I always thought it should. Get em!
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They work 0 people found this helpfulGained noticeable power in lower RPM. I’m running stage 1 velociraptor air cleaner and ultimate comp. exhaust.Its loud and has a punch.Not bad for a 17yr. old fatboy.
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Thunder Torque inserts in Cobra RPTs 0 people found this helpfulAfter recently purchasing and installing my Cobra RPT slip ons for my '07 Sportster 1200, I noticed a disappointing drop in power in low and mid range torque and zero improvement in upper range. My bike also has the Screaming Eagle intake, and ViEDs fuel system. In addition the sound, although an improvement over stock, was a bit harsh at times. Fast forward to Thunder Torque inserts. I installed the TT158s into the removable core, and man did it wake this bike up. First off the decibel rating is slightly lower, but also slightly deeper. Second, torque and smoothness were improved from idle up, from before the RPT install, and when comparing to the RPTs without the TTi, the difference, was dramatic. Now my bike sounds and runs like a Harley should. I would not have believed something so simple could have done this, if I had not experienced it myself. I cannot recommend them highly enough.
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TTI 158 are great for restoring power/torque 0 people found this helpfulI fitted Cobra NH slipon to M8 2018 SportGlide to improve exhaust sound for safety (so car drivers hopefully know I’m there). Sound was great but mid range engine torque was destroyed! TTI 158 was easy to install (drilled hole and bolted onto removable baffle). Effect miraculous! Torque restored and engine sound better than ever. Thank you DK Custom!
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Killer 0 people found this helpfulI bought a 2001 FXDX and there were already unbaffled Vance & Hines short shots and Screamin Eagle Air Cleaner on the bike. I did the Brian Thomas ( https://www.youtube.com/watch?v=iTPPP8jkje4 ) carb rebuild and got the SE Stage 1 6200 rpm module and coil kit.I did not like the pipes coming going up or down in revs so I bought a set of Thunder Torque 158's. I have them at 90 degrees and the sound is perfect and crisp all through the throttle range.No popping back on decel now. But most importantly the change in acceleration shocked me, all the way up. DK you guys gave us back the balls we lacked. This product was the least expensive of all the mods but it iced the cake. Sweet!
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OMG !!! 0 people found this helpfulThe increase in low end torque in my 88 in Twin Cam is absolutely incredible! Took out the Samson baffles and launched 'em. Thanks Guys!
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Great product happily surprised 0 people found this helpfulBought the 158w after a few guys on a fb group site reccomended them to me said it would be the best $40 I spent. When I got them in the mail I was not expecting what I got, just this little bent piece of steel, but after the install which was not hard at all I took it for a ride... the tone is deeper, the db a little louder, and the power on roll on is a noticable difference i didn't believe the hype till i did it myself. I cant wait to tweak the programmer and see what i get. I will send everyone to get these from you guys!
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158 0 people found this helpfulGreat product, very well made but could be improved for certain applications, ie mine. I used the 158 in the end of 2004 SEii muffler. I removed the bottom bolt, drilled the hole slightly larger, instructions ask for a bigger hole than i drilled but i didn't need it. The threaded bolt part is a bit larger in diameter than the original baffle bolt which is okay, but it could be a quarter inch or so longer to get the wavy part up into the center of the baffle exit. These things are heavy duty made and work well. On another bike i installed a 258 in the bell shape housing of a thunderheader, about a half inch out from the end of the baffle exit. It worked a treat, knocked the sound down enough to tame the huge roar and made the bike run even better. Well worth the money and effort. I rated the value lower because i had to pay for international shipping and currency conversion to AUD. For a USA resident would be much better value.
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Pretty Simple 0 people found this helpfulThe product was pretty simple. A bolt with a piece of metal welded on. The install was a pain in the rear. When reading the instructions I saw that Vance and Hines slash cut I had to do some inventing. It was fairly easy to remove baffles and set it about half inch behind the baffle hole. I just drilled another one and in they went. Sound wise it almost seems just as loud just a little clearer sounded. Haven’t rode it yet so can’t say about that. Overall I like them.
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1200c 06 V&H exhaust no baffles 0 people found this helpfulIt was loud and poppin on decel when i bought this bike used, added the thunder torque inserts and fixed it right up. i like that they are adjustable i got mine turned about ha 3/4 now and they sound just right one thing to note, is you have to make the stock V&H holes larger to get them to fit, you can do it on bike with a hand reamer like i did. pretty easy. check them after a few rides of high reving as they will losen up and need final tighning. would recomend forsure.
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The best 0 people found this helpfulSlapped a set of W158s on my Vance and Hines Big Radius 2:2 with no baffles and these things definitely live up to the hype and do not disappoint. More torque, a killer sound, and an easy setup. Most importantly however, is the customer support these guys offer. From my first email requesting information to helping me get them setup to achieve the perfect mix of performance and sound these guys are the absolute best. Knowledgable, friendly, and incredibly quick responses...I seriously couldn't be happier with the product or the experience from start to finish. Top notch all around, do yourself a favor and get these!
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Excellent 0 people found this helpfulThis is 3rd set of torque inserts I have ordered from DKC. They work! Buy em! ;)
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V&H Eliminator 300 no baffle or end caps 0 people found this helpfulThanks DK, i recieved the TTI 258 and they made all the difference. I got the low end back and they sound great. Thank you for the great service and im very happy with the end results. Dennis
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Great product for the money 0 people found this helpfulAfter fitting V&H slip on's my bike wasn't running the same. These have transformed the performance and virtually eliminated popping. Great value, they do what they say they do!
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TTI 158 0 people found this helpfulWith no baffles, pretty sure those are 3" diameter and need the 258's. Since you have the 158's give them a try with the baffles, you should feel a nice bump in the torque. DK Support Team. I only went with what was recommended by DK. I was told if i was going with the baffles and end caps 118 would work best, But was suggested 158'S with no baffles or end caps would be my better option. Best Regards Hey, I just tracked down the advice given you. My apologies, it was incorrect. Running with no baffles and no end caps (which is the best for power/torque) the 258's are best. If you want to run the end caps, then you could run the 158's or the 258's, but for power, the end caps are a real power robber. They really interrupt the flow, slowing down the exhaust gas velocity. Here is a link to our sizing for TTI's. http://www.dkcustomproducts.com/choosing-the-right-size-thunder-torque-inserts.htm If you are good to run no end caps or baffles, please email or call us and we will send you the 258's at no charge to make up for our error in advice given.
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TTI 158 0 people found this helpfulI purchased TTI 158 for vance & Hines Eliminator 300 Exhaust. I Tried them without baffles and without baffles and end caps on. They definately made the sound deeper. With end caps on they felt restrictive with end caps off they sounded good but didnt feel any difference in seat of the pants torque compared to the baffles without wrapping and end caps on. With no baffles, pretty sure those are 3" diameter and need the 258's. Since you have the 158's give them a try with the baffles, you should feel a nice bump in the torque. DK Support Team
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V&H Short Shots 0 people found this helpfulI installed these in my V&H Short Shots on a 2017 XL1200X. Install requires removal of pipes from the headers. I was able to use a bit slightly smaller than the 3/8in size without any issues. I recommend using a tool with a rubber handle wedges between the pipe and the insert to prevent rotation of the insert for tightening down the lock nut. These do provide a very noticeable increase in power, torque, and deeper sound. VERY PLEASED!
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Really 0 people found this helpfulI think they work. Feels better on the freeway stronger midrange. Sounds different. Rinehart tracker pipes. 2009 883L. Satisfied my curiosity
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Great update on classic design 0 people found this helpfulGreat quality and awesome design. Helped with backpressure issues I was having on a short exhuast and gave me the added benefit reduced decibels. Fast shipping and great service by DK custom.
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These work 0 people found this helpfulI installed the 158 TTI's on 07 STC with V&H long shots hoping to quiet the bang some. I could tell a difference and I like the slightly lower tone but not much quieter, (I have really close neighbors). It might be just my wishful thinking but I did seem to feel and increase in torque by seat of pants test :-) Overall, this works as stated and install was a breeze including drilling the holes larger. I also ordered one 258 for my buds Fat Boy with a header but hes OOT and will update after install.
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Good Quality 0 people found this helpfulInstalled TT-158's in Hi Roller baffles. Still snowing here off and on so have not had a chance to ride. I was delighted when the nice lady at DK took the time to go take photos of Kevin's mufflers and sent to me so I could see how he installed. That is customer service above and beyond.
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Sweeeeeeeet! 0 people found this helpfulInstalled 158’s in V&H short shots, removed baffles, on 2015 Dyna Wide Glide. This bike is so much fun to ride.
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Helps true duals setup 0 people found this helpfulI recently purchased as I am running the V&H dresser duals. My low end torque definitely suffered. I installed the 158 model into the V&H oversized 450 Raiders. The oversized from V&H has a 2.5" baffle. I removed the tip and baffle. Was able to drill the very back of the baffle and install the tti. Slipped them back together and ready to go. About 30 minutes total. Great thing was I did not have to drill through the outer part of my slip on. I run the fp3 and did live sensor data before and after. I don't know if there torque reading is accurate, but it showed a 14 ft/lbs increase. I can definitely feel the difference.
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They really work!! 0 people found this helpfulJust installed W158's on my 04 sportster and these do exactly what they say. With the videos available, removing the baffles from my stock mufflers (w/cat) and installing the TTi's was so easy it took about an hour from start to finish. I was shocked at how much more aggressive they sound now. Exactly what a Harley should sound like. Also felt an instant increase in low-mid range torque and a much smoother ride all round. I was so happy with these little bad Larry's that I just ordered the W258 for my 1200 and can't wait to put them in. A serious bang for your buck!!! Thanks DK!
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WOW! 0 people found this helpfulI pulled the baffles out of the Vance & Hines slip ons on my 2014 Iron 883 and installed the W158 Thunder Torque Inserts over a year ago and all I can say is WOW! The exhaust on this little 883 sounds wicked, very deep and throaty. The low and mid range torque is linear and pulls MUCH better. I constantly have people tell me how much they like the sound. If you are thinking about getting these DO IT! They sound AMAZING and you'll be blown away by the improved low and mid range torque. The sound when I crack the throttle is SICK. Don't wait, get a pair.
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Great sound and power for cheap!!! 0 people found this helpfulI recently put these on my 48 and finally have my bike sounding and performing to where I won’t mess with it EVER again. I originally bought the bike new at Republic HD in Stafford, TX with the typical stage one upgrades. Heavy breather, Vance and Hines Short Shots and a Screaming Eagle Pro Race Tuner with dyno time. I rode it this way for two years before I got tired of the tinny/rough sound the stock baffles made with the Short Shots. I tried the quiet baffles for a while and enjoyed the deeper tone they gave me but still felt that the sound wasn’t what I wanted. Finally I gave these TTIs a shot and couldn’t believe the difference. The low end power has improved, they are loud but deep and powerful sounding. I removed the quiet baffles (with a slide hammer) and enlarged the V&H baffles set screw hole with a drill. Super easy install and the bike sounds AMAZING. No pops or backfire off throttle in higher rpms... just pure power and sound. Thank you DK!!!
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TTi 158s in upswept fishtails 0 people found this helpfulInstalled Paughco upswept fishtsils on my 48. They are one piece pipes w/o baffles. Very loud and the bike would hardly run. No low end torque at all. Modified the 158s (ovalized) to fit and installed and adjusted. Now the pipes sound like upswept fishtails should and the low end is back. These inserts are the best.
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Great!! No more popping when deccelerating 0 people found this helpfulAmazing! These little budies seem inofensive, they seem so simple...but once installed in my FXDC they really, really do their job! I was really struggling with FI due to a lot of decceleration explosions (V&H Twins Slash slipons w/o baffles). The TTI not only eliminated Completely the popping, my bike now has a lower deeper tone, no more metallic sound and recovered a lot of torque in the lows.
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Best money I've ever spent. 0 people found this helpfulI put the W158's on my '02 Shadow VT1100 in about 30 minutes (had to drill holes), and I IMMEDIATELY felt a difference. The previous owner had taken a holesaw to the baffles and I've been trying to get the engine dialed in since I bought it. The bike sounds a lot better, it got rid of the hollow, twangy, metallic sound and now has a deep, warm grumble. I can feel a HUGE difference in torque all the way up the rev range and I actually get pushed into the seat now. All in all these are a great buy.
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