Yoshimura R77 Race Exhaust System 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. This system also significantly reduced weight over the stock system, resulting in better handling, weight distribution, and fuel economy. Tearing up track has never been so much fun. Full System includes R-77 muffler, stainless steel header and tail-pipe, low-volume insert, installation hardware, and detailed step-by-step instructions.