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About the slant: A rearward-leaning air dam would force air downwards, resulting in lift. Not good.
A forward-leaning air dam will force air upwards, result in downforce. Good.
For every action, there is an equal and opposite reaction. Push air up, you go down. Push air down, you go up.
With a flat air dam, some air would be pushed down, if the bumper above the dam sticks out farther than the dam itself, because air flowing upwards would be stopped by the bumper. More air would flow to the sides than anything, though.
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