The Slip-On represents the first step in exhaust system tuning. It is simple to install and replaces a stock muffler. It also offers the best combination of price and performance.With the Akrapovič Slip-On system you will get more power, more torque, and less weight. The Akrapovič Slip-On system gives your scooter that unmistakable deep resonant Akrapovič sound and also dramatically changes its visual appearance. Each product features Akrapovič’s finest carbon fibre end caps. EC type-approval is valid only when catalytic converter is installed.EC type-approval on X-MAX 250 is not valid.