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20's man. 20x8.5 in the front with 255's, and 20x10 in the rear with 295's. I wouldn't go much more narrow than this in the rear, they will look too skinny.
You'll find lots of opinions here. Mine: Form should follow function. Smaller diameter rims are better for a performance car. I swapped my stock 18s for 17s not long after I bought the car.
I'm sorry but there is just no way there was hardly any noticeable difference between 17's and 18's.