Akrapovic Racing and Evolution systems are designed for racing-oriented riders who demand maximum performance from their motorcycle. Both systems feature exceptional production quality, hi-tech materials, and of course increased engine performance. Their quality and reputation are further augmented by the use of the high-tech HYDROFORMING production process to form the header tubes. Besides performance, you will also benefit from great weight savings of up to 5.24 kg when compared to the stock system. The change will also be visual as our HEXAGONAL mufflers perfectly fit the exterior line of the Fireblade and add a clean racing image. Systems are not homologated and are developed only for race track use.     Performance  Measurements of the Akrapovic EVOLUTION system on the HONDA CBR 1000 RR (without the muffler insert):  Power & Torque: The exhaust system modification with the EVOLUTION system results in a major boost in performance, delivering a massive 174 HP at 12310 rpm on the back wheel. But the increased power is not available just at the top of the range; the system already shows its quality from 3000 rpm up through the entire rpm range. Maximum increased power between an Akrapovic and a stock system is 4.7 HP at 12750 rpm. In addition, the torque is substantially higher in a lower rpm area at 4000 rpm and in the middle to high rpm area.