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I spoke while before the 1M was confirmed with some BMW insiders/experts and they said that the n54 engine was very likely designed by m gmbh because of its complexity and it was a come back to turbo engines for bmw after a while so they invested quite heavily into it to make sure its a good one (didn't want to fail at this attempt)
So I would assume M gmbh used this engine again as a basis for the 1M
The N55 as I was told is not as good as the N54 and represents cost cutting for mass production engine from BMW.
Just the thought
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135i Performance
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