Originally Posted by TheRox
High redline is not that useful in turbo charged cars.
See: Porsche 911 turbo, f10 m5, Nissan gtr etc
Those are great cars you mention, but I would suggest that you read up on the technical details of the McLaren MP4-12C. Sure, this is a super car, but if you look at M history, they have been able to deliver an arguably exotic chassis and drivetrain in an every-man's car.
So it could have been, but it will not be. Well, at least not for the F8x. Maybe a future M3 will get a turbocharged V8 although I think it is more likely that we'll see a KERS Hybrid or some other mashup of today's goto efficiency tech, evolved as only BMW can do of course. In the end we get faster and more efficient cars, but we probably won't ever have an 8400RPM combustion engine from BMW again. An 8400RPM electric motor? Sure, could very well be some day far down the road.