I don't see how the M2 could surpass the existing 135i without an I6 turbocharged. I also don't see how BMW can make their M2 more than 340hp without seriously injuring the M3/4 sales.
That been said, if they do manage to build an I4 turbo that can be as smooth and torquey across the range, then I don't see why I wouldn't consider it. It can only make the car lighter and more nimble, not to mention the fuel economy which is not something in which my current N55 excels. The only drawbacks would be the sound and the tuneability.
With the next gen M3 being downsized from 8 cylinders to 6 turbocharged, and having the same power output as the current one, I wouldn't be surprised if the next M2 will be an I4 turbo with 340hp, same output as the 1M.
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