Hello everyone. I just purchased a 2004 Vulcan 2000 and don't really know anything about these bikes. It has Cobra exhaust and Power Commander III. I'm not sure if I care for the loud exhaust on it and wondered If I wanted to switch back to stock exhaust would I have to do anything regarding the Power Commander? Also, what oil would you recommend if I wanted to run regular motor oil? Thanks ahead of time for your input, and I can't wait to get it out on the road.