FMF Racing The Q4 Hex Series Slip-On Muffler 045667Quiet power with minimal sacrifice for performance The Q series features advanced engineering to precisely locate baffles and chambers to absorb sound Less mass to enhance power to weight ratio Q4 slip on muffler unless noted Made in the U. S. A. Rugged design for off road endurance Less sound equals more ground Spark arrestor included Pounds lighter than stock Power gains throughout the entire rpm range Meets FIM World Enduro sound regulations