Yea I saw the picture of that air dam. That brush guard was a great way to go. I'm going to look into something like that.
For the time being, I think I'm going to permanently fill in the holes in the factory air dam above my diy dam with some expanding foam, then bondo over it and repaint the whole thing with some bed liner. Should help some more right?
I also grabbed some rubber seals for the hood that I think I'm going to use to seal off the turn signals. That plus my add-on would give me a solid 8 inch dam