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The factory had pretty poor boost control. It's designed to only work with the stock intake and exhaust. As soon as I put on a 3" turbo back exhaust and huge cone k&n filter, and replaced all my vacuum lines, I got 10 or 11 psi.
AFAI, there is a "hack" that gets you most boost from the factory. It involves removing a factory restriction that is hidden in a vac line going to the waste gate solenoid. Replacing this and your vac lines will give you a boost increase of 3psi or so.
Skyline GTRs had a red restriction you could remove that would increase the boost. It was there to decrease stock HP but could be removed in seconds to give you free factory boost. It seems the JDM market S13s had the same deal. Too bad I threw out all that junk years ago otherwise I'd go hunting for the specific line and take a photo for you.
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