DK Custom Products

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Thunder Torque Inserts 118 For Increased HP & Torque

Availability: In stock
Item #: DK-TTI-118
Manufacturer: DK Custom Products

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 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


Increases Low & Mid Range Torque

Adjustable Sound Volume & Tone

For Your Exhaust

 MADE in The USA!


DK Custom Products


  • High-Temp Powder Coat Finish
  • Stainless Steel Studs (5/16" diameter)
  • Includes All Hardware
  • FITS 1.5" 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 &   2 into 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.)




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 and Fitment Information, to choose the Correct Size TTI for your Exhaust


A small change can make a BIG Difference!!!



Check out the Dyno Charts Above!


"Just wanted to give you a heads up. I received my Thunder Torque inserts (W118)a couple of days ago, put them in and finally was able to ride today. Great product.

It toned down the idle and low rpms on my Vance and Hines Shortshots. The increase in the mid range is awesome. I was expecting to buy new pipes, but not now. The Shortshots have become a performance pipe with great sound." -John


"I do not usually thank people, but I just got the W118 much better pulling out...Big Improvement...Anyway thanks, another satisfied customer.  Bike is a 2012 FLHTK with Stage IV Harley kit, dresser duals and street cannons.  

It did change the exhaust note as well, a bit crisper is the only way I can explain, that's also a win in my book! -Eric



"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





Customer Reviews

Awsome Review by Jason turner
I purchased a set of 1inch and 3/4 paucho drag pipes and installed them the sound just wasnt there until I installed the w118 tti ON MY 1999 1200 SKIRSTER all I can SAY IS WOW WOW WOW AND THANK YOU TO DK CUSTOMS FOR THE BADASS PRODUCT FOR SURE A SATISFIED CUSROMER (Posted on 4/23/2019)
improved exhaust tone. you feel the increase in torque and power. (Posted on 4/17/2019)
Very surprised! Review by Bill
Installed a pair on my ‘03 Night Train running Vance and Hines Original Short Shots with baffles removed.
Improved exhaust tone to a deeper rumble, noticeably increased torque and power throughout all RPM range, and almost completely eliminated decel popping (exhaust backfire).
I was skeptical of DK’s claims and several YouTube reviews but decided to try them out before spending big bucks on a new set of pipes and was both pleased and surprised with the results.
Definitely recommend this product. Make sure you contact DK to get the right inserts for your application.
(Posted on 4/15/2019)
Woke my bike up Review by Canonball
Had some cheap emgo slip-ons for my bobber along with a dynojet kit but still left the bike kinda slug-ish in low RPM but now the bike rips! best bang for your buck performance mod I have ever gotten. 10/10 would recommend! (Posted on 2/18/2019)
TTI in LAF exhaust Review by Chouille
hello from Belgium. I bought LAF drag pipes for my 2015 48 to avoid torque loss i put 118 TTI in them...It works great.

(Posted on 7/25/2018)

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