.. further up the line.
Think of it this way, once the BPV dumps air back into the intake, the VACUUM is less after the MAF, so less air will pass the MAF.

[edit]
in fact, if what Don says is true, and if under HIGH BOOST applications there is enough BPV pressure to blow intake hoses, presumably there is NO longer vacuum after the MAF, meaning air will flow back PAST the MAF backwards, further screwing up the MAF readings.

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