I believe they opooed theirs fo rthe first time at 15 psi. 12 psi is usu. the safe point on a good (brand new) motor before you start getting SUPER bad problems like detonation and lean conditions and the like. You MIGHT be able to get 16 psi if you do a stand alone and pigger injectors, but with as much as a stand alone cost, you would probably be better off just upgrading your internals.and getting some larger used injecors and a super afc.

have fun!