FMF brings you the high-performance Factory 4.1 RCT Slip-On muffler, specially designed for GAS GAS, HUSQVARNA, KTM motocross bikes. This model incorporates FMF's exclusive Resonance Chamber Technology™, applied both inside and outside the silencer body, to improve throttle flow and optimize the power curve throughout the rev range. Thanks to its Factory Forward Engineering design, the muffler is moved closer to the engine to centralize mass, while reducing its overall length to limit exposure to shocks in extreme conditions. Manufactured 100% in the FMF plant in Southern California, the Factory 4.1 RCT is designed with aerospace-grade materials, guaranteeing exceptional durability and significant weight reduction. It is also equipped with the RTS (Rapid Tuning System), allowing quick and precise adjustment to the rider's needs. This silencer is the ideal choice for demanding racers looking for performance, reliability and innovation.

Fits on

GAS GAS EC 250 F 2021

GAS GAS EC 350 F 2021

HUSQVARNA FE 250 2021

HUSQVARNA FE 250 2020

HUSQVARNA FE 350 2023

HUSQVARNA FE 350 2022

HUSQVARNA FE 350 2021

HUSQVARNA FE 350 2020

HUSQVARNA FE 450 2023

HUSQVARNA FE 450 2021

HUSQVARNA FE 450 2020

HUSQVARNA FE 501 2023

HUSQVARNA FE 501 2022

HUSQVARNA FE 501 2021

HUSQVARNA FE 501 2020

KTM XCF-W 350 2022

KTM XCF-W 350 2021

KTM XCF-W 350 2020

KTM XCF-W 450 2023

KTM XCF-W 500 2023

KTM XCF-W 500 2022

KTM XCF-W 500 2021

KTM XCF-W 500 2020