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10 psi with the GReddy kit will handle just fine. it depends on how far your friend is gonna take it. is he concern about smog legality? if not, REVHARD or DRAG kit is the way to go. thicker head gasket and a few other tricks will keep his engine safe. i think the Meguiar's twin charged typeR was pushing 24 psi on STOCK. boosted3g specializes on b18 engines. he can hook u up on this one...........
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