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I run 245/35/18 V710s on 18 x 7.5" CCW front wheels and 285/30/18 V710s on 18 x 9" CCW rear wheels. The benefit to the 285s for me is that with two drivers they don't overheat nearly as easily as the 245s. They also give the car a bit more stability in fast transitions over the 245s. The 245s can be a little dicey at times.
On the open track I would definitely want the larger rear tires again from a heat management standpoint and a stability standpoint.
A Boxster can fit an 8.5" front wheel up front and a 10" wheel in the back. I think this wheel size, using the same tire sizes I'm using, would work quite well on the track. The 245 is slightly pinched on the front wheel. Hoosiers are less so.
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