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      11-07-2010, 07:28 PM   #94
galahad05
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Drives: '07 335i e90
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The difference in performance stock to stock between the N54 and the N55 is, well, in the noise. Almost everything else other than the engine will be the deciding factor on any given day.

That said, the only real difference will be for those who want to tune their cars. Looks like the N55 just doesn't have the headroom of the N54.

As one tuner (after spending some time with an N55) put it: The N54 is a 400 HP motor detuned to ~300 HP from the factory. The N55 is a 360 HP motor detuned to ~300 HP from the factory.
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