That sounds too much like a v8 to me, i'd have to see under the hood to believe its a v6. Especially a 3.8l v6.
But back to the original question. I have to stay loyal to Flowmaster and vote for the American Thunders because I think they sound great. The Loudmouths would be neat too but they're basically the same as not having a muffler. What i'm saying is that they're not a muffler at all, they're a straight pipe with polished tips.
I dont know if running without a muffler is illegal or not where you're at but if it is then running Loudmouths would most likely be illegal too although I dont know if anyone would really stop you for it.
It would be more cost effective for you to visit a muffler shop and have them bend 2 straight pipes to fit, add hangers and polished tips to them and call it a day rather than spending probably 3x as much on Loudmouths.

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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