A standard, non-mapped 97 T5 should boost to 10psi as I recall. If I'm wrong I'll stand corrected, but I'm pretty sure it's 10. My 97 R has an MTE map and it boosts to 15psi on max acceleration.
Perhaps you could list what you have done to try and remedy the problem and then we can all go from there. Without reading the entire thread, I assume as a starting point all turbo and intercooler hoses have been replaced?? Also, when you come off the pedal after hard acceleration (and I mean hard!) are you hearing any noises??
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