Maybe the Z4is engine was developed by the M division and has been used by the Z4is as a "test mule" for the 1M? lol It dosen't seem they thought that far ahead. ( If that was fact though it would legitimize it as a built from the ground M motor).
1M seems to be a fine car IMO. I just what to know what exactly it is that I'm buying, if I buy one.
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