Recently picked up an 05 Hammer. This is all pretty new to me though I've learned a ton reading these threads. So here's my dilemma... Previous owner took the mufflers off leaving the header pipes. I am hoping I can find something used to replace it. Will any year hammer exhaust work? From what I've read it sounds like it would, just plug the o2 sensor holes if its off a newer bike. Then I read a comment saying that because newer bikes have the 106 motor it might not work. Can someone confirm?