Fitment For:

• Yamaha WR450F 2003–2006
• Yamaha YZ450F 2003–2005

The FMF Q4 S/A silencer offers a low sound output, yet it still offers exceptional power gains. The Q4 silencer puts out 94db or less and also has a USFS approved spark arrestor with no screen to clean or screen to burn through. The FMF Q4 S/A silencer has more packing volume so you have longer time between repacking. So take the noise out of riding with the Q4 S/A silencer and not the fun.

• Developed over years of championship off-road racing. Constructed with aircraft grade aluminum and high strength stainless steel.
• Max sound output 96db, most models below 93db.
• Comes standard with spark arrestor. Easily serviced for repacking.
• Use with stock or FMF head pipe.