Quote:
Originally Posted by doodlebro
N55 M2 is the highest spec. X4 M40i shares some similarities like the closed deck block and maybe pistons/rods, but you have to do a part by part comparison to see what matches and what was only for the M2.
Medium spec N55 is what's in my X3, which doesn't have anything crazy fancy but can be reliable up to 400-450 whp with proper maintenance.
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FYI to the group, there is no closed deck N55.