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" Powertrain: An upgraded version of the M5's direct-injected 4.4-liter TwinPower Turbo, coupled to an eight-speed dual-clutch automatic. BMW engineers are talking 600 to 650 horsepower."

Never, supercar must be a flatplane crank and naturally aspirated version on that engine cant be excluded, but still I think Bmw go for high revving turbocharged engine, like Mclaren Mp4

I prefer S65 Block, but Naturally aspirated and ITB, Flatplane crank, peak power about. 580bhp.