The RS-4 is a technological marvel. It features a Yoshimura duplex chamber which cancels out negative exhaust pulses; and effectively acts as a mechanical baffle before the actual perforated baffle area. This in turn improves power while lowering dB.

Stainless/aluminum muffler construction with carbon fiber tip and a 96dB spark arrested insert. Optional inserts available are motocross 99dB non-spark arrested insert, and 94dB motocross non-spark arrested or 94 dB off-road spark arrested insert. Stainless tailpipe bolts right onto stock header for easy installation.

• Complete Muffler Assembly
• Spring-mounted muffler
• Please call to insure correct replacement muffler

• Replace your scratched, dented or discolored muffler with a new sleeve
• Please call to insure correct replacement sleeve

• Repack Kits Include Space-Age Packing Material, Rivets, and Rivet Bands
• Repack should be done every 6-8 Hours of use
• Steel Wool Baffle Wrap available upon request

• Replace your scratched, dented, or discolored muffler badge with a fresh one

• Reduce dB levels in minutes for noise sensitive race tracks or trails