Sounds like you already got your setup and are happy with it, but just to add some info. The Ford Racing dual exhaust V6 upgrade comes with a finishing piece that you put over the cut part of the bumper cover. Looks like it dresses it up. Personally haven't made the jump to dual yet, but plan to go with that setup when I do.
And yes, that deal you got was awesome! Typically just the parts would cost that much or more, let alone the labor. Nicely done!