This is an expected, but fixable problem. I would bet that the rear fenders will fit at least a 295 tire. I'm sure BMW will address this if they do a competition pack, which they likely will, with wider tires resulting in better power delivery out of turns and off the line. We might see 0.2-0.3 seconds shaved off the 0-60 and quarter mile from just tires, and more with a more aggressive tune.
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