Aside from my Flowmaster catback opinions on the sound (poor) and fit (looks tacky on the smaller rear bumper cover-cars, like the 95 and older non-SC's), I'll speak to the rust issue. Mine only lasted about 5 years, before it rusted at the y-pipe welds and the mid-to-y-pipe socket connection. Although I live in Iowa now, mine has never been driven in the snow. Moisture collects internally, too. The mufflers banged against my receiver hitch, as well.
If you want cheap and decent looking, with bolt-on ease (about 2 hours to install if you are slow), get the Dynomax kit. My first dyno kit also lasted about 5 years before the inlet piping to the mufflers rusted. Mellower (better) sound, and the muffler and tips look "correct", not cobbled together. If you've got the extra cash to burn, and you are ready to fight a possible broken exhaust manifold stud (been there, done that), get the mandrel bent kit.
97 LX, 4.6, Dynomax catback, Mustang MAF/intake tube and Aviator throttle body, Xcalibrator2 by Lonnie at BOC, 180 t-stat, Super Coupe wheels with 235/60/16's, Kenny Brown strut tower brace, Tokico Blues, Eibach Pro-kit, some strategically placed MN12 Performance polyurethane pieces, '02 Grand Marquis transmission
Submariners do it deeper...