I would suggest reading the Chrysler wind tunnel tests regarding the "useless, gaudy rear spoiler". Although not very useful for a street version, the physics behind the nose cone and wing ( not spoiler ) cannot be denied. During the Aero Wars of the late 60's and early 70's, the wing cars could not lose due specifically to the nose cone and wing. It was all about the aerodynamics. Also suggested reading is: NASCAR Homologation Rules. Wkiipedia: In racing series that are "production-based", meaning that the vehicles entered in the series are based on production vehicles for sale to the public, homologation not only requires compliance with a racing series's technical guidelines (for example engine displacement, chassis construction, suspension design and such), but often includes minimum levels of sales of that model to the public, to ensure that no vehicles in the competition have been designed and produced solely for racing. Since such vehicles are primarily intended for the race track, practical use on public roads is generally a secondary design consideration, so long as government regulations are met.
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