I've got the reverse situation at the moment I've got a 730d as my 740d xdrive has been in a bump.
The 730d is a revelation on 19" wheels it's night and day better than the 740d on 20" smoother/lighter and just rolls over bumps and potholes.
Sometimes less is more, I'm seriously considering getting a set of these wheels for mine.
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730d/Z4C
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