I have an 03 GT and I chose the Magnaflow straight-through muffler. They sound great and are less restrictive than the Flowmasters. But if you plan to add and aftermarket H or X pipe later you may make your car louder than you want. Where I live restrictions on emissions are not that big of a factor. It depends on who you know right!! Anyway ... just a suggestion.
P.S. The Magnaflow are stainless steel and guaranteed never to rust, while the Flowmasters are just galvanized aluminum.
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