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I put a spintech single in single out muffler on my Titan and it sounds really good.
I had the same mufflers on my 02 GT and it sounded good as well. They sounded different but my Titan has a similar sound.
I also had an aftermarket h-pipe w/ high flow cats and that really made it sound alot better and louder.
A lot of Mustangs are running around with an offroad X or H pipe and that really make is loud and sounds awsome.