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I've been wondering about this on my car too. I've had a front undertray for awhile, which is now full length, but it's at a rather steep angle due to the high front bumper. I'm guessing this is stuffing too much air underneath the car (not more than stock, but still a lot), adding drag despite the smooth surface.
I am now toying with the front dam idea, but how would I combine it with a front undertray, or should I even bother? Just adding a dam would create quite a vacuum area, meaning the air would unattached and turbulent by the time it makes contact with the rest of the undertray. I the best solution of course would be to make a front undertray that is flush with the dam and flat from that point back. But then I'd be grinding it all the time and probably rip it off.
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