I just installed a full exhaust(V&H) and air cleaner kit(V&H) on my 2014 HD Dyna Street Bob. I called HD and they said I just need a phase 1 download. I had a friend that just got that and he sees no difference in his performance and still gets backfire. Other people tell me I just need mapping, others say I need a power commander, and other say I need a power commander and a dyno, others say I just need a dyno, others say I need a fuel pack. Please help me to understand what I need to get the best performance out of my bike.