Akrapovic BMW R 1200 R 2011 Slip-On Exhaust  Our sporty and lightweight Slip-On exhaust system offer a great balance between price and performance and represent the first step in the exhaust system tuning process. The change will be also visual as our titanium muffler adds a clean racing image to the BMW roadster. The muffler outer sleeve is made of titanium, which gives a special hi-tech touch to our Slip-On system.    Performance   Measurements of the Akrapovic SLIP-ON STREET LEGAL exhaust system on the BMW R 1200 R (with muffler insert):  Power & Torque: the exhaust system modification with the SLIP-ON STREET LEGAL EXHAUST SYSTEM results in a boost in performance, delivering 107.8 HP at 7500 rpm on back wheel. But the increased power is available just at the right moment as the system shows its quality already from 2500 rpm up to 7500 rpm. Max. increased power between the Akrapovic and the stock system is 1.7 HP at 7230 rpm. Besides this, the torque is substantially higher in a rpm area from 2500 rpm to 7500 rpm.