FMF Factory 4.1 RCT Muffler - Anodized Titanium CRF450X 2019-2025 041587 1821-1978 Big Bore Kit Snap button volume adjusters on

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

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

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

Can be oiled like stock filter for best performance

2017 Husqvarna FC 250 - - 2017 Husqvarna FE 250 - - 2016-2018 KTM 250 SX-F - - 2016-2017 KTM 250 SX-F FE - -

FMF Factory 4.1 RCT Muffler - Anodized Titanium CRF450X 2019-2025 041587 1821-1978 Big Bore Kit Snap button volume adjusters onRapid 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.