that doesn't really matter much, anyway to answer your original Q, i've seen several 10psi stock internaled f22b engines, mine is 7psi f22b2. so i'd say 11psi is an absolute max. the less tuning you have, the lower the max goes, like mine i think max is 7psi ! because i run fmu and s-afc. if it's hondata/ems then we're talking about 10 psi average (or should i say 11 max)