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Depends which JB4. The Stage 2 (with BCM) does not use additive boost, so you give the absolute target. So, if flash is 18psi and you want 20psi, enter 20psi.
Yes, JB4 reads actual pressure, actual trims, actual AFR etc. There is a DME_TARGET value that shows what the ECU is trying to achieve (stock or flash).
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