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 Racing and Evolution systems were developed to maximize the potential of the R1200GS. 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 not street legal and are designed for racing purpose only.  Measurements of the Akrapovic EVOLUTION system on the BMW R1200GS (without muffler insert):  Power & Torque: The power increase with the Akrapovic system is substantial, and can be seen from 6000 rpm right to the top of the range. At 7700 rpm we measured 112.4 HP, with a max. power increase of 6.1 HP at 7350 rpm on the back wheel. The system?s effect on the torque and power curve is huge and strongest at midrange ant top rpm.