Thanks, you guys. I think I may have slightly mis-stated my original question. When I build the car on BMW's site and select the 18" V-Spoke orbit grey wheels, it requires that I add the Track Handling Package at $1700 and also clarifies that that particular wheel choice comes with with performance non run-flat tires.
If I go with the M star-spoke wheels I have a choice of run-flat or non-run-flat tires and the THP isn't required.
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