DK Custom Products Thunder Torque Inserts - Insert Fits 2" Diameter & Larger Si…

DK Custom Products Thunder Torque Inserts are tuned exhaust restrictors that bolt into slip-on mufflers to increase low and mid-range torque while adjusting engine sound. Made in the USA with stainless steel studs and high-temp powder coat finish, they install via the existing baffle bolt hole with no modifications.

Features

• Increases low and mid-range torque
• Increased exhaust gas velocity and inertial scavenging
• Adjustable sound volume and tone
• Stainless steel 5/16" studs
• High-temp powder coat finish
• E-Z installation into slip-on mufflers
• All hardware included
• Patented technology
• Made in USA

Specifications

• Brand: DK Custom Products
• Manufacturer Part #: DK-TTI-158S
• Length: 8 in
• Width: 5 in
• Height: 1 in
• Weight: 0.3 lbs

Fitment

Fits V-twin motorcycles with 2-inch diameter slip-on mufflers and a baffle bolt hole. Compatible with Harley-Davidson and Indian Motorcycle models.

Frequently Asked Questions

How do I install these inserts?

They bolt directly into the end of your slip-on muffler using the existing baffle bolt hole — no modifications or additional holes required.

Will these work on my stock muffler?

Thunder Torque Inserts are designed for slip-on mufflers with a baffle bolt hole. Check your muffler before ordering.

Do these really increase torque?

Yes — they increase low and mid-range torque by restricting exhaust flow and improving scavenging. Results vary by engine size and tune.

Can I adjust the sound?

Yes — the inserts are tuned to adjust both volume and tone compared to your unmodified slip-ons.

Do I need a tuner after installing these?

Thunder Torque Inserts alone typically don't require remapping, but a tune can optimize performance depending on your other modifications.