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...

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...

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...

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...

The Factory 4.1 RCT incorporates FMF Resonance Chamber Technology™ both internally and externallyShorter overall length that is less susceptible to crash damage and complementary to FMF's Factory...

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...

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...

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...

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...

The Q series features advanced engineering to precisely locate baffles and chambers to absorb soundLess mass to enhance power-to-weight ratioQuiet power with minimal sacrifice for performanceQ4...

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...

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...