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They come without them so aftermarket companies can sell more spoilers. Whatever comes on the car from the factory, the owner is going to take it off and say it is a trick mod. If something didn't come with the car and should have, owners put them on. If it comes with black gauge faces, everyone wants white. If it comes with white, people put in black gauge faces. Same with spoilers, sequential tail lights in the '05 to '08 models, and one-touch convertible top operation.