The S55 engine from the F80 M3 and F82 M4 is simply a better powerplant. We all know why BMW would not give the M2 the S55 engine because M3 and M4 owners have very fragile egos. This is simply a natural law of the universe.
The N55B30T0 has a weak top end pull which is the very antithesis of what an M motor should be. It can not even top the B58 engine in said top end pull. What was BMW thinking? Oh, about those fragile M3/M4 egos.
While the F87 M2 is priced well and offers great driving dynamics it just is missing that M heart. Aulitzky Tuning fixed that problem and made the M2 what it should be.
They claim the engine has 620 horsepower and they almost back it up with full dynographs:
No reason to doubt the claim as the S55 can easily make the power. For a little bit at least.
The point here ultimately being M cars should have proper M motors. This is a great swap.