Im going NA-T so im gonna go ahead and change the headgasket and headbolts. I was thinking of using a thicker headgasket but everyone i talk to has a diffrent opinion some say it will be fine and others says i will seriously mess something up. No one can ever give me a answer as to why it could mess something up. So maybe someone has some idea. Also what are the other NA-Ters doing about tachs? Is there anyway to keep the NA tach or do you have to swap it over to a GTE one? Thanks