If you wanted to, you could start with and H-pipe swap and see how it sounds. The Saleen cat-back will bolt on to any era correct 4.6 H-pipe.
Yes, it you buy an off-the-shelf 1999-2004 Ford Mustang cat-back system the tailpipes will be short. This can cause burning the rear bumper cover.
The Borla kits use the famous "intercooled" exhaust tips. Its a pipe within a pipe with cooling fins. The MagnaFlow is a simple tip. The muffler cases can be stamped with the manufacture.
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