Not to hi-jack a thread but my buddy just obtained a 99 YZ400 that has 10hrs on a new top end, including cylinder, and new tranny. I could not go with him to check out the bike so he bought it. Well the bike has milky white oil, water leak obviously, and is in rough shape none the less. The bike does run good and was thinking of doing the auto decomp mod for him as well. I was looking at the hot cams web site and the sticky about this mod and noticed the hot cam for the mod is a 03-09 yz450f exhaust cam. I have the stock exhaust cam out of my 06YZ450 and was wondering why they would not work if the hot cam uses a 03-09 cam? Thanks!