Well, I KNOW they are better, but I don't know how much. I agree with you that you probably couldn't really tell using the "seat of the pants" dyno. Most of us don't really rev our Imperials that high anyway, D2 excluded. They are definitely better because all of the guys in FAST are using them. I don't think they were any marketing gimmick either, visually they aren't super impressive. Back in the old days most people didn't know they were better and everybody was ripping them off for headers. Rob _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today - it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/