Slip-On Exhaust. Akrapovic exhausts are the most sought after exhaust systems for their unmatched quality, amazing sound, beautiful style, and unrivaled performance. The Akrapovic Slip-On line represents the first step in exhaust system tuning. It is simple to install and replaces a stock muffler. 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. Oval, hexagonal or round-shaped canister (based on the structure of the tempered connection at the end of the header) with your choice of carbon fiber or titanium outer sleeve. Hexagonal mufflers feature a carbon fiber outlet cap to match the design of each bike. Outlet cap, perforated inner sleeve and inlet cap are all made of titanium.