| Haven't you seen those semi's with the skirts on their trailers? It keeps airflow (from a side wind) from disturbing the flow underneath the vehicle. It also creates downforce. F1 banned side skirts back in the day due to a "suction" that the skirts create when placed close to the ground. Although the one's available for the Z look nice, I wouldn't doubt their ability to help downforce. Even if it was a ~-.05 difference in drag.
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