Upgrade your motorcycle's performance with the Yoshimura 242930D320 RS-4 Header/Canister/End Cap Exhaust System. Designed for optimal sound and power, this exhaust system features a unique pentagonal-shaped muffler and maximized internal volume to enhance exhaust flow. The polyresonant duplex front chamber and stepped, two-stage core baffle ensure a perfect balance of performance and acoustics. Plus, it*s compatible with a spark arrestor/sound insert for added versatility. Features: * Muffler Shape: Pentagonal-shaped muffler for improved performance * Internal Volume: Maximized internal volume for enhanced exhaust flow * Front Chamber: Polyresonant duplex front chamber for optimal sound * Core Baffle: Stepped, two-stage core baffle for superior power * Compatibility: Spark Arrestor/Sound Insert Compatible for added versatility