Akrapovic Slip-On Exhaust Triumph Street Triple 2008-2011 Akrapovic's sporty and lightweight SLIP-ON systems 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 HEXAGONAL mufflers perfectly fit the exterior line of the roadster and add a clean racing image. The muffler outer sleeve is made of titanium or carbon-fiber, which gives a special hi-tech touch to our EC Type approval SLIP-ON exhaust system. Power Torque the exhaust system modification with the SLIP-ON OPEN system results in a major boost in performance, delivering a massive 99.5 HP at 12010 rpm on back wheel. But the increased power isnt available just at the top of the range the system shows its quality already from 3500 rpm up through entire rpm range. Maximum increased power between the Akrapovic and the stock system is 3.6 HP at 11850 rpm. Besides this, the torque is substantially higher in a lower rpm area at 3000 rpm and from middle to high rpm area. Click here for performance figures for this part NOTE Please check local laws before purchasing. Some modifications may be prohibited in some states.