Akrapovic Slip-On Exhaust Kawasaki Ninja ZX-14 2008-2011 The powerful speedster offers a great tuning platform for all levels of tuning. 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 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 and a EC Type approval version. The Akrapovic SLIP-ON system will deliver power and torque increase from a simple modification. Power output is smoother over the entire rpm range, with biggest increase in bottom and top of power curve. We measured a max. power increase of 5.3 HP at 6900 rpm and max. power output of 177.1 HP at 9400 rpm on the rear wheel. The torque is increased over the entire rpm range, which is exceptionally useful for more comfortable and smooth riding. With our SLIP-ON systems you will also save 6.55 kg in comparison with the stock mufflers. Click here to view performance figures for this part NOTE Please check local laws before purchasing. Some modifications may be prohibited in some states.