Let's stick to road cars, not sure what F1 has to do with anything.
A McLaren P1 produces 1323 pounds of downforce at 161mph. Is the GT-R's 186 at 186mph still immense? If you build a car with low drag, it won't have much lift, add a good under tray and diffuser and you should have modest downforce with no drag penalty (compared to an unclad underside at least).
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