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I don't buy the whole "an airdam only needs to go as low as the lowest component on the underbody," when, in every Bonneville class that allows an airdam, you'll see cars with that thing extended all the way to the ground--because the benefit comes not from "shielding" something sticking into the airflow, but from disallowing as much air to get under the car in the first place, instead sending it around the streamlined upper body (which is why even cars like the hydrogen Fusion tout a benefit from a smooth underbody and a very low airdam). So, I think if you're going to go with an airdam, make it as low as practically possible. The Volt's airdam used to be much lower, in fact, until enough owners complained of scraping that GM raised it.
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