To add to my reply, spoilers are also measured by efficiency. In otherwords they attempt to maximize downforce while minimizing wind resistance or turbulence produced to do so. Some of the god awful wings found on imports produce minimal gains in downforce while producing massive turbulance. A spoiler will always produce more turbulance than a clean deck lid however by working the design in a wind tunnel you can produce good resultant downforce while not sacrificing too much in the way of additional turbulance.
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