• 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
• Stainless steel header and tailpipe
• Includes 99db low volume insert
• For optional spark arrestor order 43-4673

Included Items:

(1) Aluminum muffler with aluminum end cap, removable baffles

(1) Stainless steel head pipe

(1) Stainless steel mid-pipe

(1) 8mm-1.25 x 35mm flange hex head bolt

(1) 8mm large flat washer

(1) Rubber grommet

(1) Aluminum spacer

(1) 8mm-1.25 flange nut

(2) Springs (installed)

(1) 1 5/8 in. low volume insert

(1) Adhesive heatshield foil

(1) Spring puller tool

(1) Wash plug

(2) Springs

Instructions