Yoshimura R77 Race Slip-On Exhaust Kawasaki Zx14R With its trapezoidal-shaped sleeve that maximizes muffler volume and Superbike styling right from Mladin, Hayden, and Blake Young's race bikes, the R-77 slip-on from Yoshimura is your lightweight, performance exhaust system. The R-77 Slip-On Exhaust consists of a trapezoidal-shaped sleeve, maximizing muffler volume, while offering a sharp silhouette to flow with the new body design. Features: Superbike technology and styling Maximizes torque and usable power for optimum gains throughout the entire powerband Trapezoidal-shaped sleeve Large volume of packing material Straight baffle for ample flow Innovative end-cap Removable Low-Volume Insert Stainless steel tail-pipe