No. The bike can be optimized in stock or with various modifications. You'll need to load a different map if you change your exahust. The PC website has a list of some available maps to use with various modifications on the bike (mostly different exhausts options). The maps are OK in general but of course all bikes are different and the ideal of course is to have your bike professionally tuned after your modifications, it'll cause you some $$$ though.do you have to change your exhaust befor you install a power commander?