Quote:
Originally Posted by ZZZZ
All the (stock) E90's in North America are I6's.
However the 316i, 318i, and 320i and 320si are all I4's.
323i is a Canada-only model using the N52B25.
To the OP: since the 328i sounded better than the 328xi you've driven, and both have the same engine, I'd bet it was the exhaust you were hearing. Could be a performance exhaust... ?
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to be honest I only had the 328xi for a night and I wasn't really paying attention. I had the 328 for almost a week so I got well acquainted with it. It might just be a variation in the exhaust.