FMF Q4 Slip-On Muffler — Yamaha YFZ450 (ATV/quad) 2004–2015

A straightforward way to pick up power and shed weight — bolts to your stock or FMF header and delivers the throttle response this platform is capable of.

Fits: Yamaha YFZ450 (ATV/quad) 2004–2015.

Why riders pick it:

• Hex-core spark-arrestor design keeps you compliant at trails and forests that require one
• Still delivers a genuine power gain over the stock muffler, not just a sound reduction
• Quiet enough to keep riding areas open without giving up performance
• Direct bolt-on installation, no tuning required

⚠️ For closed-course competition / off-road use only — not legal for street use in some states. Confirm your local regulations.

Not sure it fits your bike? Send us your year and model and we'll confirm.