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Thunder Torque Inserts 118 Model Family

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
  • 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 TorquesTM 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 InsertsTM.


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.

The Flexibility in adjusting sound levels is accomplished by the different shapes and angles of the W & Q Models, AND by being used in conjunction with baffles or without baffles!

What is the Difference between the "Q" & the "W" Models?

Thunder Torque InsertsTM are designed to perform well when used on slip-ons with and without baffles, drag pipes & shortys. 

Generally with baffles and the Q Model installed you will get less sound volume, especially at cruising RPM & Throttle.

The Patented design of the W Model you will generally give a bit deeper & louder sound all the way through the RPM and Throttle range.  The W Model gives a little better increase in Torque than the Q Model.

Both Models are sold in Pairs and come with instructions.

The best value, and most flexibility, is to choose the Combo Package which has both Thunder Torque InsertsTM Q & W Models along with one set of hardware.


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

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