fmf

With well over 35 years of racing experience behind it, the Fatty Gold Series pipe delivers race proven performanceThe Fatty broadens and smooths o...

The Factory Fatty is reminiscent of the “works” or cone pipe once used by Factory Teams and it shares many of the same characteristics with its’ cr...

Features high temperature-resistant fiberglassIdeal for MX applications where maximum sound absorption is not a necessity

Display comes with corresponding wash pugs

The ultimate power boosterImproved bottom to mid-range powerLess susceptible to damage than a longer headerEffectively reduces sound output by as m...

RCT (Resonance Chamber Technology) features a patented core shape that lowers decibels while maintaining maximum power outputInternal ducts in the ...

Includes MegaBomb headerThe Factory 4.1 RCT incorporates FMF Resonance Chamber Technology™ both internally and externallyShorter overall length tha...

The Factory 4.1 RCT incorporates FMF's Resonance Chamber Technology™ both internally and externallyIn addition, FMF achieves a shorter overall leng...

Overall increase in power and torqueDurable stainless steel and aluminum constructionSpace Age internal packing material for maximum longevityInter...

Includes MegaBomb headerThe Factory 4.1 RCT incorporates FMF Resonance Chamber Technology™ both internally and externallyShorter overall length tha...

Includes MegaBomb headerThe Factory 4.1 RCT incorporates FMF Resonance Chamber Technology™ both internally and externallyShorter overall length tha...

Hi-Flo end cap boosts all-around performanceComputer-designed and dyno-tested for every 4-stroke applicationEnhanced sonic evacuation delivers a hi...

Developed over years of championship off-road racingTwin-stage core design for lower sound output and extended life of packing materialComes standa...

The FMF Gnarly pipe focuses on increasing the lower RPM horsepower and torque to get you out of the toughest terrainWhen looking to add 4-stroke tr...

Overall increase in power and torqueDurable stainless steel and aluminum constructionSpace Age internal packing material for maximum longevityInter...

The Factory 4.1 RCT incorporates FMF's Resonance Chamber Technology™ both internally and externallyIn addition, FMF achieves a shorter overall leng...

Includes MegaBomb headerThe Factory 4.1 RCT incorporates FMF Resonance Chamber Technology™ both internally and externallyShorter overall length tha...

Used for a single sided exhaust system

The FMF Gnarly pipe focuses on increasing the lower RPM horsepower and torque to get you out of the toughest terrainWhen looking to add 4-stroke tr...

Used for a single sided exhaust system

Used for a single sided exhaust system

The Factory 4.1 RCT incorporates FMF's Resonance Chamber Technology™ both internally and externallyIn addition, FMF achieves a shorter overall leng...

The Q4 employs intricate chambers, baffles and proprietary multistage packing materialWith the Q4 you don’t need to hear the power, just feel the p...

Includes MegaBomb headerThe Factory 4.1 RCT incorporates FMF Resonance Chamber Technology™ both internally and externallyShorter overall length tha...