Flowmaster offers two cat-back systems, single exhaust (part # 17326) and dual exhaust (part # 17327). Can see pictures of it at my website:
http://sci-fi.ptenthusiasts.net/photo5.html
If you are talking about just replacing the muffler with a Flowmaster one, you would have to work with your local muffler shop to find a Flowmaster with approx the same dimensions. Some have done this and were happy with the sound/results. Believe it was a 50 Series Delta Flow Muffler, but check around the various PT forums and do a search for the Flowmaster model they used.
A few have used the Flowmaster Hushpower II Audi TT Muffler on their PT's.
Ansa sounds pretty sweet:
http://www.ansaautomotive.com/SoundVideo/index.html
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2002 Almond Pearl Limited Edition 27K
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