I would think you could take it to an exhaust shop and have the bad section cut out and a new piece put in.

__________________
1989 Ranger Extended Cab, 2.9L, 8.8/3.73 LS, 4X4
1997 Expedition, EB, 5.4L, Air Ride, 4X4
2005 Explorer, Limited, 4.6L, 4X4