Our sporty and lightweight SLIP-ON system offers a great balance between price and performance and represents the first step in the exhaust system tuning process.  The muffler outer sleeve is made of titanium, which gives a special hi-tech touch. We offer homologated street legal system with approved and removable noise damper.       Performance   Measurements of the Akrapovic SLIP-ON SP series system on the BMW F 800 R (without noise damper):  Power & Torque: even as a base-level component, the Akrapovic Slip-On series system delivers a performance increase. The largest effect is shown on the torque curve, while the power curve is also increased, especially in the middle and at the top of the rpm range. The maximum power increase between the Akrapovic and the stock system is 2.1 HP at 5420 rpm. Additionally, the torque is substantially higher in the lower rpm area at 3000 rpm and in the middle to high rpm area.