both jdm r's and gsrs are stamped B18c, the gsr will have the dual runner manifold and the head will be stamped p72, while the type r head will be marked pr3-"x"
if you build the motor you could probably boost as much as you wanted. I would read up in the forced induction forum as well as the motor building forum for your buld questions. A shop would probably rape you on the price of building a motor
I feel like I say this several times a day. PSI is completely irrelevant until you pick a turbo or supercharger. A stock B18C1 can handle up to 350whp with an extremely good tune. Use wheel horsepower as your guide, not PSI.
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