Go to tirerack. They have fairly rigorous comparative tests for most tire classes. You make the decision about what tire class you want to be in (and how much you want to pay).
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88 S14 M3 (NASA GTS3 racecar) / 11 6MT 550i M Sport / 14 6MT M5 Competition / 15 X5 50i M Sport (tow vehicle)
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