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I think the N55 is a downgraded engine harder to tuned and that way BMW don't suffer from warranty issues cause by mods.
If the N55 is so great why is not been used in the new 1 M Coupe.
BMW knows the potential of the N54 and that's why they are leaving N54 as the higher power option for the best in their class (335is and 1M).
Thats just my opinion
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