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Most drag racing car builders that use factory rear bumper facias, will trim the lower edge such that it's higher off the ground. There's a couple reasons, but the 'parachute' effect is one. Some dragcars rear panel will incorprate a top-hinged flapper door or two, that pop open releasing trapped high pressure while the car is at speed. While the car is at low speed or stopped, the flapper door rests closed, looking factory OEM. Only one moving part <a hinge> and no actuators of any kind.
Still, an under panel sounds like the better solution.
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