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FWIW, MAF signal, which this device modifies, is only indirectly influencing boost. So max or 3 psi on the M2 by no means is the equivalent of max or 3 psi on an M235i for example. Load is going to be calculated differently due to the differences in stock tune.
What we do know for sure is that at peak RPM the M2 has about 1-1.5psi available margin on 93 octane and no margin at all on 91.
AFAIK no one running an otherwise stock M2 with JB+ on max is having any problems.
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