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You should run a 335/30/18, or you can run a 345/35/18 and the diameter will be just over the stock size.
The 335/30/18 diameter will be slightly smaller than stock. You will also need to tub your car or have the wheels stick out about an inch which will look pretty bad! I have 335/30/18 Pilot Sports on my car with 12.5" rears.