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Originally Posted by bitcore
Which it won't.
It's a modified N55: N55B30T0. The T0 designation is what separates it from a regular N55. It is not yet publicly known what the changes the M division have done. Hopefully the changes include a turbo that can flow more than the regular N55, and stronger internal bits in the bottom end of the engine - crank, rods, pistons. I'm sure the stock boost targets will be higher to suit the current output figure claims - which can be done with the existing regular N55 turbo. However, without a larger turbo, there's significantly less aftermarket headroom for easy power increase.
The new M3 and M4 have the S55B30.
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Keep in mind that the comments above quote directly the production schedule release information leaked on the forum a while back. The engine code is N55 based, not S55.
Note the language in the C&D article:
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Powertrain: We’re fairly certain that the M2 will be powered by BMW’s prolific twin-turbo S55 3.0-liter inline-six.
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Prolific twin-turbo S55? Huh?
Prolific
adjective
present in large numbers or quantities; plentiful.
Basically, the author of this article suffers from a bit of ignorance. He has conflated the S55 and N55, which is obviously not the case.
You can ignore this bit in the article. It is poorly informed.