Sometimes forcing more air over the bonnet is a bad thing, sometimes forcing more air under the car is a bad thing. sometimes reducing air flowing out the wheels is a bad thing. You may reduce the cooling inlet drag, but lose the drag reduction caused by where the flow exits, or force more air under the car causing more drag there.
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Which brings us back to the argument about case-specific dynamics. There's just no way in advance, that one could anticipate what any given modification might do to the drag.
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completely agree^ , although you can guess based on past examples, but even then it is not always useful if you overlook a critical difference between your car and the previous example's car.