Visually I think the F30 looks best with a 19" wheel. Just my opinion. 20" looks cool too, but I think it makes the tire look like rubber bands. I like the look of meatier tires but 19" strickes a good balance between wheel size and tire size.
Performance-wise, a properly tuned suspension like the M Performance suspension and a set of lightweight 18" wheels and Michelin Pilot Sport 4S tires (non runflat) are the best you can do.
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