Flowmasters are loud, deep and throaty. Magnaflows are loud and deep but mellower than Flowmasters. JBA's are the same way.
I don't know why you're even asking this question though dude. There are like 2000 youtube videos of different exhaust systems on these cars and there are probably as many previous threads about exhaust too.
I'm thinking we need to get together an assortment of exhaust clips from different setups and compile them into a sticky so we can point directly to that instead of going over the same question every other day.

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Black 2005 Mustang v6, 5 speed, IUP, EUP and Leather.
Razzi 1/4 window scoops, Mustang GT Sway Bars, Flowmaster American Thunder Single Exhaust, Clear Front Turn Signal Lenses, Demolet CAI, X-cal2 91 tune, Hurst Comp/Plus Shifter, FRPP T-Lock, Ford 3.73 gears