Hey Metro, just common sense, Toyota knows aero and optimized this car, so anything small is just not likely to improve things. Contrary to some popular opinions in here, a large radius is better than a sharp cut off on the sides in back. If Toyota has these large radiuses designed in, and the modification takes that away, it could be worse. Also adding odd length extensions run the risk of forming vortex generators, and that would be bad. If the extension is long enough, as I said, it stands a better chance of substantially reducing the base area as you put it, this would be an improvement even if current aero design features get boogered up.
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