I put BBK shorties on after the Roush AB and love the sound. It did deepen the sound especially at idle. The rasp is still there in the higher rpm. In my opinion you can't go wrong with that combo.
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'12 Grabber Blue V6 Premium/Pony pkg
4.10's, Steeda CAI, BBK 73mm TB, BBK ceramic shorties, Roush AB, Bama 91 tune, Eibach Pro springs, BMR panhard, BMR relo brackets, Ford Racing LCA's, Koni STR.T's