20's are definitely not too big for any F car. My problem with them is weight. Even if the 20 inch wheel is only a pound or so heavier than a 19 inch wheel, the 20 inch tire will also be heavier than a 19 inch tire (apples to apples, same brand/model tire).
So overall there is always a weight penalty with 20's, even with the most exotic lightweight wheel. They look fantastic, but weight is the enemy.
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