Your point that BMW wouldn't know what they're doing when it comes to turbo engines doesn't hold. After decades of building NA engines only they announced the N54 which was a true masterpiece back then and still is now. The rumor has it that BMW M was involved in the N54 development, and I guess that's what mapezzul is alluding to.
Same goes for the S63 which was BMW M's first official shot at a turbo engine, and it was pretty good already. The S63tu goes even further, is more responsive and revs as high as Merc's naturally aspirated 6.2l V8.
Best regards,
south
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