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My concern is that your model does not recreate the undercarriage structures. The models seen are comparable to vehicles with flat belly pans. There is no turbulent flow swirling underneath to supposedly escape through those speed holes, hence no difference in your comparison models. By creating 'holes' it creates more turbulent flow @ the back. A sealed bumper would preserve a cushion or separation bubble that would allow under airflow move smoother. An aerodynamic analogy but inverted is the proven advantage of a closed tailgate than an open tailgate of a pickup truck.
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