[SiVX]

Ok, I've read theories about every opinion.
1) Avoid adding additional air to the side of the vehicle, thus increasing wake.
2) Use an air dam no lower than the lowest part of the car chassis.
3) You don't want any air traveleing under the vehicle.

So what is the deal? It seems to me that some air under the car would be good to clean up the trailing turbulance. If you look at this flow video from AndrewJ you can tell the air from beneath the car is moving more slowly and swirling.

I also know that air should meet at the same angle. pressure and velocity.
Anyway, crazy stuff. Just wondering if until I get a belly pan I should do a bigger air dam?