Enjoy a full length video from Super Streetbike. SSB took a 2008 Kawasaki Ninja 250R with a Yoshimura full exhaust system to the dyno. This exhaust has the quiet insert in place and gained more power than the straight exhaust. It gained 6 horsepower over stock, has a smooth power curve and is reasonably quiet yet still has an aggressive sound When you’re done you can browse our video library to watch all of our high quality videos covering a wide array of topics.