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I've read somewhere the resigned Saturn in 1996 had a taller, cambered roof for more head room and has lower drag than the flat roof of the prior years, even thought the frontal area is more. Looks like the optimal cd is .06 height to camber ratio. That would be about 3 inches for a 4 foot long roof. It all depends on what car you have. The transition from windshield to roof should be as smooth as possible.
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- Tony
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