For the V6 Duratec, it would be called the Y-pipe. You may want to contact Bill Jenkins at
www.teamfordparts.com and see if he can help you.
Bill Jenkins
Team Ford, Las Vegas (Nevada)
702-395-5173
bjenkins @ teamfordlv.com
Read this thread too.
http://www.contour.org/ubbthreads/showflat.php?Cat=&Board=v6maint&Number=1171688&page=0&view=collapsed&sb=5&o=31&fpart=1#Post1172299