I have 18x10.5 52et with 15mm spacers on 275/35 at stock height. I have about 3mm of room between the tire and the strut. I don't rub but the tires do stick out past wheel well, so if I want to lower the car I will need to roll the fenders. I think the 285's will be too wide and like John V said you will need spacers in the 20-25mm range to make the wheels fit. You may want to find wheels that are a better match for a Boxster.
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