Yoshimura R-77 Slip-On Exhaust Kawasaki Ninja 300 The R-77 is a perfect match for the Ninja 300. Its styling and internal dynamics complement this new bike exceptionally well. Not only does the R-77 enhance the aggressive styling, it provides an ample boost in horsepower and torque from mid-to-peak RPMs, just where you need it. Improving styling and performance was not our only goal. The R-77 also reduced weight over the stock muffler, resulting in better handling, weight distribution, and fuel economy. Tearing up track has never been so much fun. Slip-On includes R-77 muffler, stainless steel tail-pipe, low-volume insert, installation hardware, and detailed step-by-by instructions. NOTE This exhaust is CARB compliant. Please check local laws before purchasing. Some modifications may be prohibited in some states.