Exhaust System: Yoshimura RS-4S EPA CRF300L '21 - '25 Pre-Order Race, RS-4, Slip-On, Stainless Steel with Carbon Fiber End Cap Pentagonal-shaped muffler Maximized internal volume Polyresonant duplex front chamber Stepped, two-stage core baffle Spark Arrestor/Sound Insert Compatible Choose System Slip-On Muffler $548.95 Complete System $648.95 Please contact us for availability information $548.95