4 Stroke

FMF Racing Anodized-Titanium Factory 4.1 S/O w/Carbon Cap - 045629

The Factory 4.1 exhaust system with the Powerbomb header is FMF's premier exhaust system. This system is perfect for the track or dunes, and is used by factory teams such as KTM, Epic Can-Am and Rath...

FMF Racing KTM 350-450SXF/XCF 18-22/HQV FC/FX350-450 19-22/GGMC/EX350F-450F 21-23 AL F4.1 SO w/C Cap - 045628

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...

FMF Racing KTM 350SXF/450SXF/FE Q4 S/A - 045627

Developed over years of championship offroad racing. Max sound output 96dB; most models below 94dB. Use with stock or FMF header. Constructed from aircraft-grade aluminum and high-strength stainless...

FMF Racing KTM/Husqvarna Powercore 4 Hex Muffler - 045626

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...

FMF Racing KTM 450SXDDE 18-22/XCF 19-22/HQV FC450FE 18-22/ FX 19-22/ EX450F 21-23 TI MB Header - 045625

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...

FMF Racing KTM 450SXDDE 18-22/XCF 19-22/HQV FC450FE 18-22/ FX 19-22/ EX450F 21-23 SS MB Header - 045624

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...

FMF Racing KTM 350SXF/XCF 19-22/HQV FX350 19-22/GGMC/EX350F 21-23 SS Megabomb Header - 045622

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...

FMF Racing KTM/Husqvarna S/S Megabomb Header - 045620

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...

FMF Racing KTM 250-450SXF 15-18 FE/XCF 16-18/ HQV FX250-450-501 16-18 SS 4.1 RCT SO w/CRBNCAP - 045594

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...

FMF Racing KTM250-450SXF 15-18/XCF 16-18/EXCF 17-19/ HQV FC/FX250-450-501 16-18 Hex Q4 S/A Muffler - 045590

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...

FMF Racing KTM 250-450SXF 15-18 / XCF 18-22/HQV FC/FX250-450-501 16-18/FE 17-19 PC 4 Hex Muffler - 045589

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...

FMF Racing KTM 250-450SXF 15-18 FE/XCF 16-18/ HQV FX250-450-501 16-18 F 4.1 RCT TI Anod SO w/CRBNCAP - 045586

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...