FMF 044232 Q4 Spark Arrestor Slip-On Muffler for Yamaha YZ/WR 250F/450F

The FMF Racing Q4 Spark Arrestor Slip-On Muffler delivers exceptional noise reduction without sacrificing performance, making it the ideal choice for off-road riders who need USFS-compliant sound levels. Engineered specifically for Yamaha YZ250F, YZ450F, WR250F, and WR450F models, this slip-on exhaust combines FMF's racing heritage with trail-legal functionality.

Key Features:

• USFS-approved spark arrestor included for legal trail riding
• Sound output as low as 92 dB for quiet operation
• Approved by Blue Ribbon Coalition and ORBA
• Compatible with FMF or stock header pipes
• Advanced internal design allows for easy repacking maintenance
• High-performance construction that doesn't compromise power delivery

The Q4 muffler features FMF's innovative internal core design that achieves remarkable sound reduction while maintaining optimal exhaust flow. The user-serviceable design means you can repack the muffler quickly and easily when needed, extending the life of your exhaust system. Whether you're riding competition off-road courses or exploring USFS trails, the Q4 Spark Arrestor delivers the performance you expect from FMF Racing with the sound compliance you need.