FMF Factory 4.1 RCT Muffler - Anodized Titanium CRF450X 2019-2025 041587 1821-1978 Big Bore Kit Can be oiled like stock

Can be oiled like stock filter for best performance

2021-2022 Yamaha YZ 250 FX - - 2020-2022 Yamaha WR 250 F - - 2019-2022 Yamaha YZ 450 FX - - 2019-2022 Yamaha YZ 250 F - - 2019-2022 Yamaha WR 450 F - - 2018-2022 Yamaha YZ 450 F

with each hand capable of being regulated individually

back main elastic bands and the 3D mesh behind the main CELL structure provides extra ventilation

FMF Factory 4.1 RCT Muffler - Anodized Titanium CRF450X 2019-2025 041587 1821-1978 Big Bore Kit Can be oiled like stockRapid Tuning System (RTS) Shorter overall length that is less susceptible to crash damage Massive Power gains throughout the RPM range. Huge weight savings Made in the U. S. A.