4 Stroke

FMF Racing KTM SX-F 07-15/XC-F 07-15/XCF-W 08-16/SMR 07-10/HSKY FE250/350 14-16 PC 4 Hex Muffler - 045553

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 Beta 350/390/400/430/450/480/498/500/520 10-18 Hex Q4 S/A Muffler - 045522

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 Beta 350/390/400/430/450/480/498/500/520 10-18 Powercore 4 Hex Muffler - 045521

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 Beta 350-390 10-18 SS Powerbomb Header - 045520

The redesigned PowerBomb is a 4-stroke header that incoporates FMF's patented PowerBomb module at a precise location in the initial stage of the header, resulting in performance gains and improved flow.

FMF Racing KTM 350 EXC-F/500 EXC 12-16 SS Aluminum Factory 4.1 RCT SO Muffler - 045472

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 KTM 450/525EXC/MXC/SX/XC 04-06/XC/XCW (2007) Powercore 4 Muffler - Used w/ Stock header - 045135

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 26+ Yamaha YZ450F Factory Anod 4.1 RCT w/ Carbon Cap - Complete System w/ TI MB Header - 044484

FMF Racing 26+ Yamaha YZ450F Factory Anod 4.1 RCT w/ Carbon Cap - Complete System w/ TI MB Header

FMF Racing 26+ Yamaha YZ450F Factory Alum. 4.1 RCT w/ Carbon Cap - Complete System w/ MB Header - 044483

FMF Racing 26+ Yamaha YZ450F Factory Alum. 4.1 RCT w/ Carbon Cap - Complete System w/ MB Header

FMF Racing 26+ Yamaha YZ450F Titanium Megabomb 2-Piece Header - 044482

FMF Racing 26+ Yamaha YZ450F Titanium Megabomb 2-Piece Header

FMF Racing 26+ Yamaha YZ450F SS Megabomb 2-Piece Header - 044481

FMF Racing 26+ Yamaha YZ450F SS Megabomb 2-Piece Header

FMF Racing Yamaha YZ450F 24-25 Anod Fact 4.1 RCT w/ R. Carbon Cap Comp Sys w/TI MB Header/ Mid Pipe - 044478

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 YZ450F 24-25 AL Factory 4.1 RCT w/ R. Carbon Cap Comp Sys w/SS MB Header/ Mid Pipe - 044477

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...