The FMF Factory 4.1 RCT is the pinnacle of performance mufflers for your Yamaha YZ450F/FX (2018-2025). With FMF Resonance Chamber Technology™ and Factory Forward Engineering, this aerospace grade muffler offers maximum power and centralized mass. Shorter length also reduces crash damage. Made in SoCal.

-Available in Blue Anodized Titanium Muffler with Carbon End Cap 

-Massive Power gains throughout the RPM range.

-Huge weight savings

-New RTS (Rapid Tuning System)

-FMF uses the highest quality proprietary blend of alloy grade titanium made specifically to our standards.

Fitment:
2018 Yamaha YZ450F
2019 Yamaha WR450F
2019 Yamaha YZ450F
2019 Yamaha YZ450FX
2020 Yamaha YZ450F
2020 Yamaha YZ450FX
2021 Yamaha YZ450F
2021 Yamaha YZ450FX
2022 Yamaha YZ450F
2022 Yamaha YZ450FX
2023 Yamaha YZ450F
2023 Yamaha YZ450FX