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If it is an S14 engine with the S14 JDM Ball Brearing unit you can safely go to 12psi. More is possible but it will wear the turbo out quickly, especially if you had a shitty bypass.
Its on an apexi stand-alone unit, so your best option for more power is to install 740cc injectors, and a GT2871r or similar turbo, for a 320rwhp on stock cams, or 350-370rwhp with a set of upgrade cams (S3 JWT I recommend for OEM springs)
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