The Akrapovic Racing or Evolution system with the HEXAGONAL design muffler goes extremely well with the bold design of the Kawasaki. And of course in addition to visual enhancement, these systems also offer a substantial performance boost. In keeping with the character of the bike, these systems were designed for riders who know how to get the most out of their machines. Power & Torque: as can be seen from the power and torque curves, the system delivers a major performance increase. The location of the increase fits the character of the bike, starting in the middle of the range and reaching to the top end, right where racing conditions demand it. At 12000 rpm the Kawasaki put out a huge 170 HP with our system. Max. increased power was a massive 7.2 HP at 12300 rpm. Choose style from pull down menu.