FMF Racing

Runs well with sound-restricting mufflers; effectively reduce sound output by as much as 1.5 dBProduces the low end of a longer header and the top end of a short headerLess susceptible to damage than...

Hi-Flo end cap boosts all-around performanceComputer-designed and dyno-tested for ever 4-stroke applicationEnhanced sonic evacuation delivers a higher flow of exhaust gases, which increases powerA...

The Q4 employs intricate chambers, baffles and proprietary multistage packing materialWith the Q4 you don’t need to hear the power, just feel the power!Less sound equals more groundPower gains...

RCT (Resonance Chamber Technology) features a patented core shape that lowers decibels while maintaining maximum power outputInternal ducts in the chambers of the RCT system increase internal volume...

Spark arrestor screen insert included94dB insert included For closed course competition only.

Spark arrestor screen insert included94dB insert includedFor closed course competition only

Meets USFS and FIM World Enduro sound regulationsPower gains throughout the entire rpm rangeLess sound equals more groundSpark arrestor includedRugged design for off-road enduranceMade in the USA For...

Factory 4.1 RCT incorporates the FMF Resonance Chamber Technology™ both internally and externallyAchieves a shorter overall length that is less susceptible to crash damage and complementary to...

Factory 4.1 RCT incorporates the FMF Resonance Chamber Technology™ both internally and externallyAchieves a shorter overall length that is less susceptible to crash damage and complementary to...

Factory 4.1 RCT incorporates the FMF Resonance Chamber Technology™ both internally and externallyAchieves a shorter overall length that is less susceptible to crash damage and complementary to...

Factory 4.1 RCT incorporates the FMF Resonance Chamber Technology™ both internally and externallyAchieves a shorter overall length that is less susceptible to crash damage and complementary to...

Hi-Flo end cap boosts all-around performanceComputer designed and dyno-tested for every 4-stroke applicationEnhanced sonic evacuation delivers a higher flow of exhaust gases, which increases powerA...