I think the general consensus, arrived at in other threads on this very topic, was that a good front air dam could deliver about 70-80% of the results of a comprehensive belly pan at 10% of the cost and effort. If you already have a dam built the obviously start there. Establish some baseline results without the dam for comparison, then run some tanks with to see how it fares.
Add the side skirts a la Aerocivic and it likely gets even better.
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