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I seriously doubt the stock turbo is going to hold 22psi. The best my STi did on the stock turbo was 307whp. Front mount, full turbo back, UTEC, CAI, 850cc injectors. If I remember right 19psi was all it had. And that was a peak pressure. I upgraded to a FP Green turbo and did 377whp on pump gas. C16 was good to about 430ish whp.
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