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the N55 in my 135is feels FANTASTIC.....so i have no problems with the M2 having the N55. It is a very smooth and linear engine with lots of power in all ranges......i've driven N54s in the past on several different cars; i appreciate it, but don't find the N55 to be much of a deviation from the overall feel of the N54.
Wasn't the S55 partially derived from the N55?
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