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I just swapped my rear bumper from a GT to a GT/CS. I absolutely love it! the one thing a recommend that I did with my bumper that isn't done by ford when they are originally put on the CS' is to have all of the black textured plastic shaved down on the sides of the bumper. This will make you paint job look 10 times better the factory!
Pretty sure the CS came with the sides smoothed from the factory.