Quote:
Originally Posted by xcusem3
No mechanical differences between any n55 engine regardless of what car/suv it was in
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This is false. The N55B30T0 (M2) has a few differences over the N55B30O0 (everything else). S55 crankshaft bearings, S55 pistons, modified oil supply sump with addition of suction return pump, wiring harness and spark plugs from S55, additional oil cooler and aux coolers.
See the M2 Technical Training manual from 2016.
Also, the M2 turbo is a different part #, however it is uncertain if there are any actual changes to it.