• The work that went into developing the RS-4 muffler has paid big dividend in Off-Road Racing; winning multiple Supercross and Motocross titles since it's inception
• The current generation RS-4 is based on that research and development, and the result is a unique design that provides and unrivaled combination of power and quiet exhaust tone
• The RS-4 features a Polyresonant duplex chamber and two staged stepped baffle for increased performance while a carbon cone end cap finished off it's innovative styling
• Pentagonal shaped sleeve
• Front muffler cap functions as a polyresonant chamber which helps reduce noise
• Two-staged stepped baffle
• Carbon fiber end cap
• Stainess steel tailpipe
• INS-19-K low volume sound insert installed
• INS-16-K 94db low insert included
• For optinal spark arrestor order 43-4673

Additional Fitment:

Yamaha -

YZ450F  2016

(1) Muffler W/mid-pipe

(1) Exhaust plug

(1) 8" X 10" Sheet of heat shield foil

(1) Low volume insert

(1) Exhaust clamp

(1) Rubber grommet

(1) 8mm-1.25 X 35mm Flange hex head bolt

(1) 8mm Flat washer

(1) Aluminum flange spacer

(1) 6mm-1 X 12mm Button head bolt

(1) 6mm External tooth washer

Instructions