Quote:
Originally Posted by clarence
I think there are some internal differences. For a start, the engine model code is different (N20B20 vs N20A20), some engine parts are different (e.g. different part #'s for the turbo, engine block etc.), & they have different compression ratios.
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Look at the latest parts system updates
The X1 20i and Z4 20i engines changed from December 2011 to the N20 used in the 328i. Exact same part number and parts.
Earlier engines were different