Measurements of the Akrapovic SLIP-ON EC Type approval system on the Kawasaki Z 1000 (with noise damper):

The Akrapovic SLIP-ON system will deliver a big power and torque increase from a simple modification. Power output is smoother over the entire rpm range. We measured a max. power increase of 3.7 HP at 10200 rpm. 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 more than 4 kg in comparison with the stock mufflers.