Akrapovic Triumph Street Twin 16-20 Slip-On Line Exhaust (Titanium) - S-T9SO2-HCQTBLSlip 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. Race proven materials.