08-11 KAWASAKI ZX14: Yoshimura R-77 Slip-On Exhaust - Dual (Race/Stainless Steel With Carbon Fiber End Cap) The popular R-77 offers outstanding performance, thanks to being developed in the heat of competition. It features a trapezoidal design, which allows a large volume of packing material and in turn delivers top performance. The R-77 muffler's front cap is MIG-welded, while the end cap is riveted using high-end 304-L polished stainless steel rivets and bands.Superbike technology and styling.Trapezoidal-shaped sleeve.Large volume of packing material.Straight baffle for ample f These exhaust systems are designed with nothing but power in mind. Each Race Series system is developed in accordance with noise compliance regulations imposed by most racing sanctioning bodies worldwide.