I currently have 2006 WR450 and looking to get a little more performance from the bike. I have done all the free performance mods to the bike. The last is the engine timing. The intake cam on the WR & YZ are the very same. It is only the exhaust cam that is different. So these are my questions. Cam Mod 1. If you retain the stock exhaust cam and rotate the exhaust cam clockwise one tooth is there a big difference in performance? Has anyone done this? 2. If you purchase the YZ exhaust cam, is it installed in the stock factory position or is the exhaust cam advanced one tooth. As anyone done this mod? 3. Which mod performs the best? Thanks for the help guys.