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No C4 came with a spoiler or wing (other than the molded-in lip that is the top of the rear bumper).
Taking it off would likely involve accessing the retaining bolts or buts, likely by removing the rear bumper cover or at least removing the tail lights, then filling the holes and paint.
Thank you! i've seen so many with spoilers that I've been starting to wonder if they did come from the factory, but i guess that was just the cool thing to do in the early 90s.