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The slots you have are fairly narrow - this will seal them off (effectively) above a certain speed. I would try doing a block that has a single opening. And if you can, prevent air that comes through the opening from not going through the radiator. Because, stock opening are often so over sized, they let lots of air escape - which adds drag for nothing.
What doe the upper opening look like? Block that off completely first, before doing anything about the lower opening has a positive effect, without affecting the cooling. The lower opening is more effective, typically.
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