I have something like that on my car for the front wheels. I cut the inside of my plastic fender linings and have the air vent out the sides.
In my case most likely useless, and might have actually made things worse.
I'll post an image later since I'm using my phone to create this post.
Racers ( or is it ricers ) do the back bumper thing a lot on their cars, but from what others have said here, it doesn't help and just makes your car look silly.
Better to go with a bellypan.
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