OPEN BOX FMF Q4 HEX Muffler YZ450F 2018-2025 044442 1821-1837 XD-4 Helmet Vented Shield FIM approved 304 stainless steel

FIM approved 304 stainless steel end-cap

5:1 Race Piston

4 Into 1 System

ATV-specific grips feature a smaller inner flange and two grips of the same diameter for the thumb throttle use

OPEN BOX FMF Q4 HEX Muffler YZ450F 2018-2025 044442 1821-1837 XD-4 Helmet Vented Shield FIM approved 304 stainless steelThe Q4 employs intricate chambers, baffles and proprietary multistage packing material With the Q4 you dont need to hear the power, just feel the power! Less sound equals more ground Power gains throughout the entire rpm range Spark arrestor included Pounds lighter than stock Rugged design for off road endurance Made in the U. S. A. 2019 2025 Yamaha YZ450FX 2019, 2023 2025 Yamaha WR450F 2018 2025 Yamaha YZ450F Fitment Disclosure This quick reference