Measurements of the Akrapovic SLIP-ON OPENL system on the KAWASAKI ER-6N (without muffler insert):

Power & Torque: the exhaust system modification with the SLIP-ON system results in a major boost in performance, delivering a usable 72.3 HP at 8900 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 2000 rpm up through entire rpm range. The maximum power increase between the Akrapovic and the stock system is 5.2 HP at 5280 rpm. Additionally, the torque is substantially higher in the lower rpm area at 3000 rpm and in the middle of rpm area.