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The purpose of an airdam is to keep the car's aerodynamically dirty underside (and front tires) out of the airstream, increasing frontal area to reduce Cd. So if the airdam is taller than needed then you will be wasting energy to push air.
If the underside is already smooth then an airdam will hurt CdA. Wheel spats would be enough in that case.
A-B-A-B testing will answer the OP's question.
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is where you're going, not how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread
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