Don’t change the exhaust, chip it and add a super charger. haha.
Do a search on you tube and you’ll get dozens of people who post vids of what there Mustang sounds like and the exact specs of what they bought to make that sound.
Ok, best Exhaust, Borla system, probly run you $600, then you gotta put it on. Cheap exhaust, Gibson exhaust, maybe $150-250, byut it will rust out rather quickly. Go Flowmaster for in between, that is what alot fo people buy, and of course get an X-pipe.
I have a 2002 Mustang GT and I have Flow Master American Thunder Cat back sistem which comes with 2 1/2 inch w 40 series Flow Masters and 3″ inch tips. Also added BBK shorty header w BBK X pipe w BBK high flow cats to keep it legal and BBK Cool air intake and it sounds Great! I got everiting from summit is not expensive and you will love the wat it sounds. Alot of other people ask me what kind of exaust sistem i have on. trust me