mine was peekin at 15-16psi think it had standerd head gasket wi a cam, chip on the fuel side of things, intercooler, n k&n n zorst (sorry im not very specific but i dont really know whats been done to the engine it was Mcpikies old scort cab if u know it) i had it 5 days n doin 140 holdin 15psi it decided it didnt like the head gasket no more n broke it between piston 1 n 2 n out the front all over the turbo.... had an uprated gasket put in n i think the boost has been turned down a little will find out when i get car bak hopefully 2nite.