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Turbo output is not measured in psi because psi is dependent upon the restriction which the turbo is pumping against.
Turbo output is measured in airflow, commonly in pounds of air/min
As important as the maximal airflow is the adiabatic efficiency.
I suspect maximum stock boost is at the edge of the "reasonable" adiabatic efficiency island.
I've looked for and have been unable to locate the compressor maps for the 63tu turbos. If you can locate them please post them.
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