This is the flagship of the Akrapovic exhaust system range, used and tested by our top factory teams in motorsport racing. It is simply the finest exhaust system available. Each model is unique and dedicated to maximizing the performance of an engine, while reducing overall weight for optimized handling of the whole motorcycle. It is made entirely of titanium, with the muffler outer sleeve available in carbon fiber as well. In most cases we also offer street legal versions.  A carbon fiber outer muffler sleeve is also available Use of hydroforming technology for an optimized exhaust gas flow The muffler clamp is made from carbon fiber; the metal clamp that is welded to the muffler can in some cases replace our regular carbon fiber clamp Repair kits are available for all models Some models are available in a homologated street legal version A muffler insert to reduce noise is optional  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. Beside performance you will also benefit from great weight savings, up to 7.28 kg if compared to stock system. The change will be also visual as our HEXAGONAL muffler perfectly fit the exterior line of the Ninja 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 KAWASAKI ZX-10R (without muffler insert):  Power & Torque: the exhaust system modification with the EVOLUTION system results in a major boost in performance, delivering a massive 176.6 HP at 12400 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 3000 rpm up through entire rpm range. Max. increased power between the Akrapovic and the stock system is 14.9 HP at 12400 rpm. Besides this, the torque is substantially higher in a lower rpm area at 3000 rpm and from middle to high rpm area.