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Until there is an official announcement, no one knows, but it is still fun to speculate. There is, in my opinion, no way BMW is going to put the M3/4 S55 into an M2 and call it an S55. They might put in the S55 with enough differences (such as different turbo and intake cooling systems) in the M2 to call it a N55B30T0, though. After all, the S55 internals will all fit, the R&D has been done to verify safety margins to well above the planned HP rating of the M2, they already have a supply chain for the S55 internals and the base N55 internals are supposedly riding the ragged edge of reliability at the M2 power levels.
That is my prediction.
A screaming turbo 4 would be fun, though, and would help with weight.
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