I put a steeda high flow x on mine and it definitely got louder. I have roush ABs as well.
You can also have the resonators cut out, but IMO it sounds like crap with the roush. Incredibly raspy.
Keep in mind if you get a high flow x you WILL need a tune.
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2014 Mustang GT Base MT82 -Stock 3.73s, Roush axleback, Steeda 93R tune, Steeda Hi-flow X-pipe, 19" Charcoal AMR's, smoked front and rear side markers, 20% tint, quarter window louvers, Steeda Ultralite springs, Koni Str.t shocks/struts, MM camber plates, J&M adjustable panhard bar, BMR LCAs and relo brackets, Barton shifter and 2-post bracket, Black Modern Billet Grilles