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I think that a front air dam without side skirts will not be as effective as a smooth full size undertray with wheel fairings.
With an air dam and side skirts, you don't have to care about how rough the underside of your car is, plus it's probably easier to build and install, but it can increase your frontal area by a good 10% and frankly does not really look good compared to a stealthy undertray.
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