Quote:
Originally Posted by Zebra99
I'm almost certain all IS engines are N54 regardless of year.
I know for certain in the 335is they are still n54's, but I guess it's possible on the z4's this isn't the case...doesn't seem likely though that BMW would use an N55 with PPK here considering they don't make that power anyways.
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Wrong, the 335is is N54, the 135is is N55 (which is probably why the 135is doesn't have overboost function).