My son has a 2006 Spec V with about 100k on it and a blown head gasket. I would like to find out the compressed thickness of the OEM head gasket but I haven't had any luck with google. The engine has the Nismo header, cat back, CAI and cams (and suspension and wheels but the does not matter for this discussion.). Because the longer duration cams lower the dynamic compression a little, I would like to put in a slightly thinner head gasket to bring the dynamic compression back to what is was before the cams were installed. Cometic makes head gaskets with compressed thickness from 0.027 to 0.060 so I am thinking about using them. Just need to figure out which one.