Yoshimura R-77D Slip-On Exhaust 1118123520 The R-77D muffler has been developed throughout years of racing efforts, and hours of meticulous research and development by Yoshimura engineers. Its distinctive dual outlet end-cap design puts an enticing twist on the style of the original R-77, and further increases the mufflers open outlet area, resulting in increased exhaust flow while maintaining moderate decibel levels. Stainless Steel Mid-pipe/Stainless Steel Muffler/Carbon Fiber End Cap.