Exhaust System, Yoshimura RS-4S EPA CRF300L '21 - '26 Race, RS-4, Slip-On, Stainless Steel with Carbon Fiber End CapPentagonal-shaped mufflerMaximized internal volumePolyresonant duplex front chamberStepped, two-stage core baffleSpark Arrestor/Sound Insert Compatible Choose System Slip-On Muffler $548.95 Complete System $738.95 Ships in 3-5 business days $548.95