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12 psi is stock boost pressure on Silvias with factory boost solenoid, so 10-12 psi will be fine. Just make sure you have a wide band and boost gauge before upping the boost. I drove my car for 3 yrs at 12psi with a t28 daily, still runs as strong as it did the day I bought it. This is on stock ecu.
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PM me for s13 or s14 parts!
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