Friend of mine was looking into the Remus stuff for me over the summer. Friend of his was a NOPI distributor or some crap like that. NOPI was able to get it then, but they couldn't figure out what it was, and wouldn't let me return it if it turned out to be not what I wanted... So I passed.
http://www.remus.at/html/products.asp -> Car -> Ford -> Mondeo Typ BAP 16V (click Go Further) -> Select either engine.. and then you can see a picture of the parts. The header is indeed there. And it will probably cost $600 from CEC.
Since their site is in German, I really can't figure out what the rest of that exhaust stuff is. Not too much info on it, and trying to translate it with Google doesn't give me any more info.