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I've been wondering the same thing.
My (rudimentary) understanding is that the airdam helps by directing the air away from the underside of the vehicle where there's lots of junk to cause drag. The airdam would increase the frontal area (I'm sorry if I'm misusing the term - please correct me if I'm wrong) but the cost here is supposed to be more than made up by the reduction in drag from under the vehicle. But if you do a proper belly pan, will the airdam still be a worthwhile investment or will the increased drag of the airdam negate or maybe even exceed its positive impact?
It would seem to me that the use of both a belly pan and an airdam might well produce low pressure area under the vehicle that would increase downforce (and probably improve handling) but might also increase drag?
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