Surprised that I listed power last? It’s last because it isn’t the primary draw these days, or at least it shouldn’t be. Again, twenty years ago you could get big gains simply by slapping on a pipe, but these days, stock exhausts do a damn good job of offering broad, useful power. There is certainly still some room to improve performance, but if you install a full exhaust system, you absolutely have to do it in conjunction with a fuel controller like a Power Commander. If you’re not tuning your fuel to match your new system, you’re leaving power on the table and probably causing your bike to run lean. That means crappy throttle response, high engine temps, and lots of popping on decel.