The Slip-On system with a muffler made from proprietary high-strength and lightweight titanium delivers more power, improves responsiveness, and adds more torque. The result of the computer-designed exhaust system with optimal exhaust-gas flow is the deep sound. The sound is made louder by removing the point-welded block in the link pipe that prevents bypassing the uniquely designed muffler. Please note: when the bypass is unblocked, the EC type approval is not valid. Complete the look with a set of tailpipes in titanium or carbon fibre.If the stock system does not have integrated exhaust valves then select the optional Akrapovic sound kit for adjustable sound. If the stock system already has integrated exhaust valves, Akrapovi? valves P-HF621 (quantity 2) are required.