Akrapovic RACE Full exhaust. Shorty. Akrapovic Racing and Evolution systems are designed for riders who demand maximum performance from their motorcycle. Both systems are significantly lighter, if compared to the stock exhaust system and feature exceptional production quality, hi-tech materials and of course increased engine performance combined with pure racing sound output. The Akrapovic street legal Racing and Evolution systems were developed to complement the racing character of the S 1000 RR. The Evolution system is made entirely of our exclusive high grade titanium while the Racing system uses stainless steel header tubes and link pipe. We offer titanium or carbon-fiber muffler for each combination. Both systems are street legal and are equipped with hi-flow catalytic converter and valve.      Performance   Measurements of the Akrapovic street legal EVOLUTION system on the BMW S 1000 RR (without muffler insert):  Power & Torque: The power increase with the Akrapovic system is substantial, and can be seen from 5500 rpm right to the top of the range. At 13300 rpm we measured 189.4 HP, with a max. power increase of 9.1 HP at 8200 rpm. The system?s effect on the torque and power curve is huge and strongest at midrange rpm.