You could always goto http://www.testpipe.com/ and get one of their fake cats. I think it's illegal to not have a cat, though. Well, maybe it's just in CA, but if I get caught w/o a cat or muffler, my car gets impounded.
+Ford Thunderbird 1997 - V8 +Ford Contour 1995 GL [REST IN PEACE :(][Champagne|ATX] -9mm Ford Racing wires -CTA Intake Kit -Removed exaust resonator