Sorry, what I meant was I'm currently on 6psi and was hoping to go to 15-18psi with stronger internals to get to a target of hopefully 450ish rwhp. If what OP said is true and that the HKS 3037 kit for the VQ will top out at 400rwhp on pump fuel then spending the money on a built engine and winding up the boost is not cost effective if I can only get an extra 50hp.
Again, sorry if I confused anyone.