Originally Posted by kardboard
Twin turbo'ing will solve both your power issues and lag issues. I expect a 4 cylinder twin turbo set up with M3 suspension, dct, brakes, and similar CFRP panels such as the hood, roof, and trim.
Seems like future Ms will be about choosing a motor first then a style as they will all be fairly similiar (1M/M3) (X5M/X6M) (M5/M6)
I can only imagine how small the turbos would be on a twin turbo I4 setup. The turbos wouldn't do anything past 5,000 RPM.