DK Custom Products

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Thunder Torque Inserts 158 For Increased HP & Torque

18.95
Availability: In stock
Item #: DK-TTI-158
Manufacturer: DK Custom Products

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18.95

 DK Custom Thunder Torque Inserts Increase Torque & give Flexibility in sound volume increasing inertial scavenging reducing engine pumping losses, increasing exhaust gas velocity Harley Davidson

  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!

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?

 

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 maximun 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 decible levels.

 

 

 

 

The comparison may seem subtle but decible 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.)

 

 


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.

The "Q" model is no longer being manufactured.

Click this LINK to see Pictures & Fitment Information, to Choose the Correct Size for your Exhaust

 

 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 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

 

 

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Customer Reviews

Quality
Value
Thunder Torque Inserts 158 Review by Roman B.
I 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!!!! (Posted on 5/18/2020)
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Good Little Pieces of Metal Review by John
Nice 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. (Posted on 5/13/2020)
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Very pleased with the product Review by Zac
Got 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. (Posted on 5/6/2020)
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Best bang for the buck! Review by Erik
TTI 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. (Posted on 5/5/2020)
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Awesome product Review by Robert
I 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. (Posted on 4/14/2020)
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torque insert Review by jim
sounds great (Posted on 4/11/2020)
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158 torque insert Review by Kelly
Put 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. (Posted on 3/27/2020)
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More torque please! Review by Sylvanus
Excellent craftsmanship, sound and torque increase.
Thank you! (Posted on 1/20/2020)
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Freakin Amazing Review by Fokus2x;
I 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. (Posted on 1/20/2020)
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I'm happy Review by Frank
My 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.

(Posted on 1/6/2020)
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As Advertised Review by Dale
Bought 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. (Posted on 12/21/2019)
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Another 5 star review Review by AustinK
I 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. (Posted on 11/13/2019)
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2 -1 Short Side Dump Exhaust Review by VRADMAN
Was 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. (Posted on 11/5/2019)
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Great product for my Cobras slip ons ! Review by Arnaud from France
I 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 ! (Posted on 10/28/2019)
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Great product! Review by Bill
I 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! (Posted on 10/15/2019)
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Wow Review by Dennyb
I 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! (Posted on 9/25/2019)
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They work Review by Mark
Gained 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. (Posted on 9/23/2019)
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Thunder Torque inserts in Cobra RPTs Review by Handirifle
After 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. (Posted on 9/19/2019)
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TTI 158 are great for restoring power/torque Review by DL
I 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! (Posted on 9/9/2019)
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Killer Review by Pete
I 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! (Posted on 8/20/2019)
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OMG !!! Review by GaryT
The increase in low end torque in my 88 in Twin Cam is absolutely incredible!
Took out the Samson baffles and launched 'em.
Thanks Guys! (Posted on 8/14/2019)
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Great product happily surprised Review by Matt
Bought 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! (Posted on 7/25/2019)
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158 Review by Jimmy
Great 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. (Posted on 7/17/2019)
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Pretty Simple Review by John
The 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. (Posted on 7/16/2019)
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1200c 06 V&H exhaust no baffles Review by Skip In Alaska
It 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. (Posted on 6/27/2019)
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The best Review by Bill D
Slapped 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! (Posted on 6/25/2019)
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Excellent Review by C
This is 3rd set of torque inserts I have ordered from DKC. They work! Buy em! ;) (Posted on 6/20/2019)
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V&H Eliminator 300 no baffle or end caps Review by DD
Thanks 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 (Posted on 5/8/2019)
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Great product for the money Review by Gazza
After 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! (Posted on 5/3/2019)
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TTI 158 Review by DD
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.

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.

(Posted on 5/2/2019)
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TTI 158 Review by DD
I 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

(Posted on 5/2/2019)
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V&H Short Shots Review by NoSlackPatriot
I 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! (Posted on 4/22/2019)
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Really Review by Cal rider
I think they work. Feels better on the freeway stronger midrange. Sounds different. Rinehart tracker pipes. 2009 883L. Satisfied my curiosity (Posted on 4/15/2019)
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Great update on classic design Review by Fasttrack
Great 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. (Posted on 4/3/2019)
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These work Review by Pablo
I 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. (Posted on 3/29/2019)
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Good Quality Review by Oakie
Installed 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. (Posted on 3/21/2019)
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Sweeeeeeeet! Review by Buck Bang
Installed 158’s in V&H short shots, removed baffles, on 2015 Dyna Wide Glide. This bike is so much fun to ride. (Posted on 12/13/2018)
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Helps true duals setup Review by Livewire
I 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. (Posted on 10/29/2018)
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They really work!! Review by Q
Just 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! (Posted on 5/2/2018)
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WOW! Review by Dirt
I 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. (Posted on 4/15/2018)
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Great sound and power for cheap!!! Review by JMC87
I 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!!! (Posted on 4/13/2018)
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TTi 158s in upswept fishtails Review by Bob
Installed 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. (Posted on 12/17/2017)
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Great!! No more popping when deccelerating Review by YeyO
Amazing! 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. (Posted on 11/11/2017)
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Best money I've ever spent. Review by Brad
I 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. (Posted on 8/27/2017)


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