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2003 Mustang GT 5 speed with Flowmaster American Thunder catback and Mac offroad H pipe. I have the A/T on there already and I want it louder. Also how well will it fit? Stock headers. Thank you for your time and input
it will sound great but just to warn you before you start it. please get another change of underwear. your going to need it.
You have a monster sounding exhaust setup right there!!! If you wanna make it louder, then do what jdaniel said - longtubes. Id go with the BBK ceramic coated. You can even make your exhaust sound a LITTLE bit louder than that with some induction mods.