4 Stroke

FMF Racing 23-25 Yamaha YZ450F Titanium Megabomb Header w/Mid Pipe - 044476

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 of a shorter header.

FMF Racing Yamaha YZ450F 23-25 SS Megabomb Header w/Mid Pipe - 044475

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 of a shorter header.

FMF Racing Yamaha WR250F 20-21 Anod Titanium Factory 4.1 RCT SO Muffler w/ R. Carbon Cap - 044474

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 damage and complementary to our Factory Forward...

FMF Racing Yamaha WR250F 20-21 SS Aluminum Factory 4.1 RCT SO Muffler w/ R. Carbon Cap - 044473

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 damage and complementary to our Factory Forward...

FMF Racing Yamaha WR250F 20-21 Hex Q4 S/A Muffler - 044472

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 and contraction of exhaust sonics through the system...

FMF Racing Yamaha WR250F 20-21 Powercore 4 Hex Muffler - 044471

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. Aluminum construction and stainless steel Hi-Flo end...

FMF Racing Yamaha TTR110 08-24 SS Anodized Titanium Mini Moto Fact 4.1 Slip-On Muffler w/SS Header - 044468

Race-inspired, price-point muffler made for maximum power output. Aircraft-quality extruded aluminum canister with stainless steel components.

FMF Racing Yamaha WR450F 2020 Anod TI Factory 4.1 RCT SO Muffler w/ R. Carbon Cap - 044466

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 damage and complementary to our Factory Forward...

FMF Racing Factory 4.1 RCT Aluminum Slip-On - 044464

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 damage and complementary to our Factory Forward...

FMF Racing WR450F 20 Powercore 4 Hex Muffler - 044462

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. Aluminum construction and stainless steel Hi-Flo end...

FMF Racing Yamaha YZ450F 20-22/YZ450FX 19-23 Titanium Megabomb Header w/Mid Pipe - 044459

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 of a shorter header.This Part...

FMF Racing Yamaha YZ450F 20-22/YZ450FX 19-23 SS Megabomb Header w/Mid Pipe - 044458

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 of a shorter header.This Part...