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      05-14-2012, 03:05 PM   #24
ATX78703
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Drives: 2014 335i
Join Date: Jul 2011
Location: Austin, TX

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i have driven and owned both, n55 has less lag than n54 and n55 is actually a more technologically advanced engine. there is a quicker spool up intake that you get with a twin-scroll system, even though it is only "one" turbo. n55 is actually a "smoother" engine.

But the N54 has easier tuning options especially for max power output.
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2014 335i RWD: ZMM, ZDA, ZDH, ZPP, ZTP, 2NH, 2TB, 5DL; Z4A MPPK; AW ext / VB int
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