Quote Originally Posted by aaronmt73 View Post
Im curious about that as well.Are there different numbers on the 2013 heads then on the 07 heads?I have a 07 as well,it has a DBR 1.1 kit but ive always wondered what a few more psi would do?I was told there may be issues with the air injectors.
same part# on 2013 and 2007 heads. my 07 is unpainted from factory so I think it is a early 07 build. I have heard only 06 and early 07s were unpainted powerheads. I am thinking maybe exhaust ports are a little higher.