Have tires that plan to use for track time at HPDE and other "just for fun" track usage. The treads are different by a few tenths (one is about 6-7/32" and the other is 4-5/32"). Is this acceptable on a 2002 M3 without doing anything ugly to the rear differential? I plan to drive to the track and back on these tires, couple hundred miles total... Thanks for your help.