FMF Factory 4.1 RCT Muffler - Anodized Titanium CRF450X 2019-2025 041587 1821-1978 Big Bore Kit Tapered design has square lines

Tapered design has square lines for elegant style

Can be oiled like stock filter for best performance

Snap button volume adjusters on upper sleeve with hook and loop adjusters on wrist and waist for an optimized fit

AR shield reinforcement on the palm slider for superior abrasion resistance

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

FMF Factory 4.1 RCT Muffler - Anodized Titanium CRF450X 2019-2025 041587 1821-1978 Big Bore Kit Tapered design has square linesRapid 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.