Hi! I had a Devil exhaust, but I broke it and bought a new, original exhaust system from a -09 in mint condition for a very good price. And after that my bike feels sluggish from the bottom. Could this be due to a jetting issue (from what I understand, you change the jetting when installing performance boosting exhaust systems)? Or could it be as simple as the other exhaust gave me that much more bottom power? Or maybe a clugged main jet or something?