Tractor-like bottom end pull, thicker midrange and rugged 18-gauge steel construction. O-rings included

Larger diameter canister for more tunability and increased packing life Race-tested, smooth power curve throughout RPM range Engineered to assault modern tracks and trails Delivers a crisp,...

Hand-pounded seams for superior flow, lighter gauge metal for the Factory sound. Hand pounded seams for smooth flow transitions 19-gauge steel on the header position Lighter 20-gauge steel on...

The most copied pipe in the world and #1 best seller for FMF, the Fatty broadens the powerband and provides significant increases throughout. Increases throttle response and enhances over-rev ...

Tractor-like bottom end pull, thicker midrange and rugged 18-gauge steel construction. O-rings included

The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology™ both internally and externally. In addition, we achieve a shorter overall length that is less susceptible to crash...

The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology™ both internally and externally. In addition, we achieve a shorter overall length that is less susceptible to crash...

The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology™ both internally and externally. In addition, we achieve a shorter overall length that is less susceptible to crash...

A 4-Stroke header system that incorporates FMF's patented Power Bomb module at a precise location in the initial stage of the header system; by positioning the "Bomb" at this key point, the expansion...

The PowerCore 4 was developed to increase the horsepower and torque throughout the entire power curve producing a noticeable power increase that is useable and compatible with every style of riding...

The ultimate power boost, the MegaBomb Headers improve performance along the bottom and mid-range powerband. Patented FMF technology combines the benefits of a longer header, with top end peformance...