Moved to "Zetec performance". Ford Racing did sell a header that had the bung on it already. The only other alternative is that you have the bung welded in yourself on your current header or another header. When you say you upgraded to the SVT exhaust do you mean you went from manifold back or flex pipe back with the exhaust?
I know that a tune would eliminate the Check Engine Light from coming on but I don't know if that would help you pass emissions or not. I have never had to go through it since I live in an area that doesn't require emissions checks.