Very interesting statement from Dr.Nitschke ... if you read between the lines:
Quote:
MT: Tell me about light weight. Is the new M4 lighter than a 435i?
FN: Absolutely. We will use lightweight parts in the places where it matters, at the ends of the carand high up, and in high-rpm parts of the powertrain. A carbon fiber roof, of course, and aluminum and magnesium and carbon fiber in the crash zones. An aluminum hood, and a new carbon fiber trunk lid.
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... that could have consequences on the choosen engíne layout(!) ... has Dr.Nitschke told us between the line the answer on the great engine question!?