I'm running the Brad's Power addiction head. I think he claims it will add around 8 or so horse. my compression went from 105 to 125. Bumped my rpms up from 7800 to 8100. I'm not running a pcV. I was impressed.
That's pretty good increase in compression i pulled a compression on mine and it's at 121 now both side's i will to swing in to brads and pick one up here in the next week or two. thanks for the reply.