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From looking at what you have already done with the belly pan I doubt you will see a reduction of cD*A from adding an air dam, however you could experience other benefits such as reduced lift in either the front or back, depending on where you positioned the air dam.
I would also consider doing an air dam style flexible tire spat in front of your front tires at about a thirty degree angle towards the inside. You have probably more to gain keeping the wind off your high cD tire than your relatively smooth underbelly.
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