Very cool. What you are seeing with the are dams just in front of the tires is what are know in the industry as "Tire Kickers" which push the air down around the tires. The front air dam does a lot of the same so that you don't have air flow over the underbody which has a lot of anti-aero crap (suspension and exhaust bits)
If you have a belly pan, the lower air dam would get a lot smaller.
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