Measurements of the Akrapovic RACING system on the Yamaha YZF R6:  Power: the linear supply of power up to 12600 rpm is the first thing that catches your eye about the power curve. With the use of our exhaust system the power increase begins at 6000 rpm, and by the time you reach 12700 rpm, 108 HP are being delivered to the rear wheel. The maximum power increase over the stock system is shown at 8100 rpm, where it reaches 5.6 HP. Although this is a racing exhaust system, we were able to increase power in the middle of the range as well. With this we also made the exhaust system suitable for more comfortable riding. Torque: the torque curve also shows a major increase in the middle of the rpm range. With our exhaust system, there is enough torque so that you don't have to wind the engine out to get the torque you need. But if you do, you'll find enough torque at the top of the range as well, since the torque band is both wider and higher at the top of the range than the stock curve.  In addition to improved performance, both systems offer the obligatory weight savings, the RACING system being 2.2 kg lighter than the stock system, and the EVOLUTION system 3.02 kg lighter. This might not sound like much in the showroom, but on the track it could make all the difference!