Pics of pro-touring Duster with 20s?
I would really try to talk you out of 20s and into 18s, just because of the overall tire height. You really want to have a tire of about 25.6" overall diameter. Anything bigger than that and you'll have trouble turning it in the front. Also, I really believe that at this tire height the optimum performance is found at 18". The wheel/tire package will be a bit lighter, won't ride too harshly, and still provide great steering feel