FMF Racing

The ultimate power boosterImproved bottom to mid-range powerLess susceptible to damage than a longer headerEffectively reduces sound output by as much as 1.5 dBRuns well with sound restricting...

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...

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...

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...

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...

Overall increase in power and torque Durable stainless steel and aluminum construction S

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...

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...

For closed course competition use only.

FMF brand decal sticker

Replacement spring and O-rings kit for exhaust pipe Pipe spring kit includes 2 springs and 2 O-rings.

Replacement spring and O-rings kit for exhaust pipe Pipe spring kit includes 2 springs and 2 O-rings.