DK Custom Products Thunder Torque Inserts - Insert Fits 1" Diameter & Larger Si…

DK Custom Products Thunder Torque Inserts are patented tuning devices that bolt into the end of slip-on mufflers to increase exhaust gas velocity and scavenging for low- and mid-range torque gains. Fits 1" diameter and larger slip-on muffler exits on V-twin motorcycles.

Features

• Bolts into slip-on muffler end using existing baffle bolt hole
• Stainless steel 5/16" diameter studs
• High-temp powder coat finish
• Adjustable sound volume and tone
• Increases low and mid-range torque
• Patented technology
• Made in the USA
• All mounting hardware included

Specifications

• Brand: DK Custom Products
• Manufacturer Part #: DK-TTI-118S
• Length: 8 in
• Width: 5 in
• Height: 1 in
• Weight: 0.125 lbs
• Material: Stainless steel studs with high-temp powder coat

Fitment

Fits V-twin motorcycles with 1" diameter or larger slip-on muffler exits. Installs on most aftermarket and stock slip-on configurations.

Frequently Asked Questions

What mufflers will this fit?

Fits slip-on mufflers with 1" diameter or larger exit tubes. Bolts directly into the existing baffle bolt hole — no modifications needed.

How much horsepower and torque will I gain?

Gains vary by engine size, tune, and bike setup. Primary benefit is low- and mid-range torque from improved exhaust scavenging and gas velocity.

Can I adjust the sound with these inserts?

Yes — the design allows for adjustable sound volume and tone by tuning the insert position and configuration.

Is installation difficult?

No — it bolts into the muffler's existing baffle bolt hole. E-Z installation without special tools or muffler modifications.

Are these street legal?

As a tuning insert, check your local emissions and noise ordinances before installation.