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the more air you push around and ove the car the better.. real test that any one can do is this , take a 1 foot by 1 foot by 1 foot box, hold it out the window at 60mph.. then place a cone on its front end then hold it out the window.. what one seems to cut through the air better..
I can say that my nose on my car made huge diffrences when getting blasted bu a big rigs air shock wave, its very solid when passing a semi.. however the added length of the nose and tail is noticeable in crosswinds.. crosswinds effect the car more since there is more side profile to catch the wind..
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