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Cleaner aero. Open wheels cause all kind of problems. The Mercedes W196 sometimes used a more sports car style body work with fenders on higher speed circuits back in 1955 I believe. Closed wheels have been banned in Grand Prix/F1 ever since. Similary fuel injection has been banned in NASCAR since the Black Widow Chevies in '57. All of these rules are archaic but have been around so long that they now somewhat define each of the series mentioned and the machinese within.
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