MasterPonAtari

The exhaust on my cavy is falling off and i was wondering if I should wait until the salt on the roads eats it off, or I should go ahead and do something about it? Should I straightpipe it, open headers, do a catback exhaust, or just put a huge rice fartcannon on it? Ebay 2.5in. in 4in. out muffler maybe (I'll have to weld some hangers on it)? The car already has still intact 2.5in. piping on so I don't think I need to do a catback replacement?...