I saw this while I was looking through my jegs magazine. Its a little ways down the page. Its the first time I have personally seen a cat back exhaust for a Taurus that can be gotten without a custom job at a garage.
That system is has been out for years. Not that great IMO, either. Get some cheap turbo mufflers put on at your local muffler shop, maybe even have them remove the 3rd cat, and you'll have the same performance for half the price.
To answer the original question, yes, the ATX only catback is a direct fit for other model Taurus' and Sable's, exc. Police Package. Applying it to a Police Package will require buying a flex pipe, since the police package doesn't ultilize a flex pipe.