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I've found that 225/45 front & 255/40 rear Bridgestone RE71Rs on stock 17"x 7" fronts and 17"x 8.5" rear wheels is the fastest. I've also run Toyo R888R's on wider 18" OZ wheels but that resulted in slower track and autocross times (and a little fender rub). My '98 Boxster is stock with the exception of font adjustable LCA's. I think the lower HP car just doesn't like turning the larger/fatter wheels and tires.
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