Depends if the mufflers were part of a catback or just welded on. If part of a catback they should have had hangers. If not you can just buy the universal hangers that bolt around the flow tubes if you really want.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.