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I have no way of proving this but I reckon BMW have chosen to use high revving N/A engines of modest capacity to insure that the torque levels are only produced to the upper levels of the rev range. This means that gearbox, driveshaft, diff, etc., can be made as light as possible in comparison to the likes of the C63.
I guarantee that if the engine/drivetrain complete for both the M3 and the C63 were laid out in front of us and weighed, we would find that the M3 (even an M-DCT equipped one) would be much lighter. It's one of the reason for their remarkable low draintrain lose.
As for whether Mercedes and weighing their engines differently than BMW, that sounds ridiculous. Why would they do such a thing, surely they all have to measure in the same way or is that opinion soooo wrong.
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