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 2022-2023 Gas Gas MC 350F, 2021-2023 Gas Gas MC 450F, 2021-2023 Gas Gas EX 350F, 2021-2023 Gas Gas EX 450F, 2019-2022 Husqvarna FC 450, 2019-2022 Husqvarna FC 350, 2019-2022 Husqvarna FX 350, 2019-2022 Husqvarna FX 450, 2018-2022 KTM 450 SX-F, 2018-2022 KTM 350 XC-F, 2018-2022 KTM 350 SX-F, 2018-2022 KTM 450 XC-F, 2018-2020 KTM 450 SX-F FE
