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Badblack....OEM Turbos will pull 22PSI or better with JB S2 and proper octane since they have one less exducer and a different compressor geometry. No different then a High Bypass Jet engine with a bigger Compressor section usually has a lower EPR (Engine Pressure Ratio) Where a lessor bypass engine has a much bigger compression ratio.
I used to feel the OEM turbos where spinning much harder....Whatever its worth.
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