If you have the 725 style wheels, they are 7.5" wide and will fit up to a 235/45-17 tyre (specified for 7.5" to 9" wide wheels), but a Michelin Pilot Sport 4S in 225/45-17 (specified for 7" to 8.5" wide wheels) would probably give the best grip of any commonly available tyre and still maintain the correct overall tyre diameter.
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