Yoshimura Rs-4 Signature Series Dual Exhaust System Suzuki Dr-Z400S / SM Features Rs-4 Twin Pipe Exhaust Kevin Schwantz Supermotard Design Pentagonal-shaped sleeve Front muffler cap functions as a polyresonant chamber which helps reduce noise Two-stage stepped baffle Carbon fiber end-cap Stainless steel header, Y-pipe, and tail pipes Includes new custom kickstand