I'm getting to the point where I'm ready to step it up with some big mods. I have CAI, exhaust (not cat-back; see sig), and Predator. I'm looking at options and there seem to be a lot of combinations of heads and cams. First off, do I need new heads if I want to do a cam swap? If I do, will the heads give me any benefit without a new cam? What are my options for different brands/levels of aggresiveness/etc? I know this is pretty broad but I tried to do research but I couldn't seem to turn up any clean-cut results. Just a person here or there running this or that set-up, but not necessarily why they were running what they were. Can anyone shed any light for me?