Hello to all, I just joined the site and must say i am impressed with all the knowledge floating around in here lol. I just bought a 03 r1. It has a full aftermarket exhaust that does not have the stock butterfly in it for the servo motor. I do have a power commander and kand n air filter in it. I have been told that without the butterfly in the exhaust that i will lose low end power and take off. My question is can this be avoided by the power commander? or should i put the stock exhaust on it. Low end power and take off is important to me so any help or advise would be greatly appreciated.