The Factory 4.1 RCT incorporates FMF's Resonance Chamber Technology™ both internally and externally
In addition, FMF achieves a shorter overall length that is less susceptible to crash damage and complementary to their Factory Forward Engineering - moving the muffler closer to the motor to centralize mass
The Factory 4.1 RCT is constructed from only aerospace grade materials that meet their exacting specifications and is manufactured 100% at their Southern California factory
Massive Power gains throughout the RPM range.
Huge weight savings
RTS (Rapid Tuning System)
FITS - 2023 KTM 450 XCF-W, 2021 Gas Gas EC 250F, 2021 Gas Gas EC 350F, 2020-2023 Husqvarna FE 450 , 2020-2022 Husqvarna FE 350, 2020-2022 KTM 350 XCF-W, 2020-2022 KTM 500 XCF-W, 2020-2022 Husqvarna FE 501, 2020-2022 Husqvarna FE 250
