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I didn't look close enough, my bad. As for being MAP, I thought I'd read somewhere that the engine is tuned to see when the wastegate opens on a stock setup, so if the wastegates are no longer recirc that it'd cause a moment of lean condition when they go off. I'm not claiming to be a source of knowledge on this, I'd just love if I could get a more pronounced BOV that what I get already. The S63 has the BOV as an integral part of the charge pipes, I don't know where they're at on the S63TU, N63 or N63TU for comparison...those cars also have MAF's while the S63 doesn't, for whatever that's worth.
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