We love HMF systems at Sinister ATV/mc Accessories - they always perform better than you hope and more than live upto what it says on the box.

Not one unhappy customer in three years of trading with these guys - that says it all for me. Superb quality and performance every time ! ! !

HMF Engineering Inc. has been manufacturing some of the highest performing exhausts in the power sports industry for over a decade. These exhausts are, hands down, the best after-market parts in the power sports industry.

Quad Magazine says HMF Exhausts are

"The Most sought-after performance part in the ATV world."

Our CNC mandrel bent 304 stainless steel headpipes and non-restrictive internal cores produce insane amounts of both horsepower and torque. They allow you to ride harder, ride faster, conquer the most aggressive terrain, and bring your riding to a whole new level.

Available for Sport ATVs and Dirtbikes, the new HMF Competition Series features the all new TriMax Core. The entire purpose of the TriMax Core is to allow the rider to dictate the type of power and sound that they need, when they need it.

The Trimax Core will feature 3 stages of power and sound.

Stage 1 uses an insert that restricts sound levels extensively yet produces industry leading power at the approved dB level.

Stage 2 uses a different sound altering insert that partially lowers dB sound levels without losing the power increase gained in Stage 3.

Stage 3 acts as an unrestricted core producing high dB levels with industry leading power throughout the entire RPM range.

The Series also received a face lift. Available in high-tempered Black Aluminum which also features a Stainless Steel Euro End Cap (round or elliptical) that gives the exhaust a sleek style and great sound output.

Stainless Steel rivet bands are wrapped around the shell and air riveted in for more durability and security.