The dynamic superbike with just 250 cc of engine capacity offers a great tuning platform for motorcyclists who desire something special. Our 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 hexagonal muffler outer sleeve is made of titanium or carbon-fiber, which gives a special hi-tech touch to our SLIP-ON system. We offer open slip-on exhaust system only that also features removable noise damper.       Performance   Measurements of the Akrapovic SLIP-ON OPEN system on the KAWASAKI Ninja 250R (without muffler insert):  Power & Torque: the exhaust system modification with the SLIP-ON OPEN system results in performance increase, delivering a 27.6 HP at 11200 rpm on back wheel.. But the increased power isn?t available just at the top of the range; the system shows its quality already from 4000 rpm up through entire rpm range. Max. increased power between the Akrapovic and the stock system is 1.1 HP at 12200 rpm. Besides this, the torque is higher in a lower rpm area at 3000 rpm and from middle to high rpm area.