Slip-Ons represent the first step in the exhaust system tuning process, and they offer a great balance between price and performance. Change the nature of your bike by adding more power, improved performance, and the unique Akrapovic sound. Everything packed in stylishly designed Slip-On exhaust systems. The result of taking design very seriously is a beautifully crafted exhaust system with a titanium muffler outer sleeve and plenty of carbon fiber parts. Race-proven materials.With the muffler please choose additonal one of the mandatory needed 2 link pipes (with or without catalytic converter) or the Evolution header.EC type-approval is valid only when link pipe with catalytic converter is installed.