Measurements of the Akrapovic EVOLUTION system on the YAMAHA YZF R6 (without muffler insert):
Power & Torque: The power increase with the Akrapovic system is substantial, and can be seen from 7000 rpm right to the top of the range. At 15000 rpm we measured 121.1 HP, with max. increased power of 5 HP at 8600 rpm. The system’s effect on the torque curve is similar to the power curve. The main increase starts at around 6500 rpm and continues right into the over-rev range.