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starts to build in a 3" system, around, 28+PSI I believe, but I would have to search to find it... the vast majority of Z's seem to run smaller turbos that never really venture that high anyhow, so 3" is plenty for the mass Z32TT population... For those of us with 35+psi capable turbos, there may be marginally measurably gains with a slightly larger system when running full boost with high octane, but blah blah, I'm hella happy with my 3" exhaust system for the time being :) ~Mario D.
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