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Well the N54 is being phased out in favor of the N55, so it would be an N55 if anything.
I think the turbo 6 is doubtful for the F20/F21 hatchbacks. Even for the F22/F23 coupe/convertible, an I6 is not certain. The next revision of the I4 is said to be capable of around 70hp/L. That would be 280hp or so, which is within spitting distance of the current 135i. Also, the next 1M is heavily rumored to be a turbo 4 as well.
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