the shop that works on my bike checked cam chain tensioners said they were wore about 50% so planing on doing upgrade during winter primary to.just saw a guys post about can of worms. bike has 32000 on 01 electraglide not going to make a hotrod out of it . may change cams but they will probly be stock don't know alot about motors i read alot of post i can tell the ones that are talking like they know what is best and the ones that think they know.