This is a question for SOS on the board your pulleys on your site the rating of boost is that with your recommended head gaskets? If so I see the 3.2" pulley says 10psi for the AP2.. What would that be without the head gasket.. 12-13?

 

u can go 12 psi with out head gasket...

 

You should see closer to 11psi with that pulley average with ap2. Head gasket thickness shouldn't affect how much boost you see at the manifold.