HMF Engineering

141403706186-JETKN0410

HMF Yamaha YFZ 450 2004 - 2010 Competition Slip On Exhaust Muffler & Jet Kit K&N

Complete Systems

Three exhaust inserts are included to give the rider the ability to quickly change the power and sound according to the riding conditions.
The Competition Series uses a mechanical core to control exhaust pulses and set power levels where they're needed.
The exhaust shell is made of T6061 Aluminum that weighs substantially less than stock.
USFS Approved: All HMF offroad exhausts come with a USFS approved spark arrester.
Two Year Warranty: HMF Engineering Inc. warranties all exhaust systems for two years from the date of purchase for all manufacturing defects.

Arguably the highest performing after-market exhaust on the market, the HMF Competition Series is a pure blend between optimized performance and versatility. The secret to it's power lies within the Trimax Core. This unique triangular core accepts specially designed exhaust inserts that provide the rider the ability to quickly change the power and sound according to the current riding conditions.

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