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Air dams?
He could actually be speaking of a number of things, not just the oval plastic pieces with horizontal bands that are inserted into your bumper, allowing air to pass thorugh to the radiators.
There are other things that can be considered "air dams":
1. There are rubberized plastic flap thingies (technical, huh?) that extend downward about two inches from the front wheel well that push air away from the tire. Mine are half torn off and need replacement. They make a flapping sound when I make U Turns and the tires grab them and pull them back, then release them. Freaked me out until I realized this rubbery stuff was making the racket, not my suspension!
2. Under the car, there are two air shields that are kept up with two kinds of clips. These make the car quieter on the road (less wind noise) and make the car faster as it reduces drag. One goes from the front bumper to the firewall, and the other goes from the firewall back to the beginning of the engine compartment.
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