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275 is unnecessary. Running a 17x9 with 245 or 255 front and a 275 rear is probably best for the grip, while a square 255 would likely be best for tire wear. That said, after a few of these events on Hankook RS4s (14 hour and 24 hour), I found them to last for-bloody-ever.
You can likely fit a 997S oil cooler on the car, which is the biggest easily fitted oil cooler.
I'd also run 3 CSF radiators.
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