My comp cams thumpr stage 1 cams at getting installed in my car. I am using the comp phase limiters. Well the nice engineers at Ford decided to change the design of the cam phase sprocket and the tools the come with the com cams phase limiters will not work on it. I believe the guy at Blow By Racing said they design change is on the 2008 mustang but not sure. I just wanted to write this and let everyone know that may may putting cams in their 2009 Mustang GT.