I honestly can't answer that. I've been interested in it, but I have my own setup in the back.
I do know it's plug and play for the shaker systems, but not sure about the base stereo. I would shoot shelby customer service an e-mail. How To Install A Shelby/Kicker Stereo Upgrade - Mustang Monthly
2011 3.7L MT82 Kona Blue GT/CS Pedestal Spoiler, Cervini's HE hood, Stillen chin spoiler, BBK headers, GT T/B, Steeda tune, Ram 9.5 Dual Disc clutch, 3.15 axle T2R Torsen, 285/35/18 w/ Steeda 18"x 9.5"+44mm Q1s, Steeda Sports springs/Koni struts/Viking shocks, Shelby adj front sway bar, Boss302 Rear sway bar, Whiteline Watts Link, 14" "Brembo-ish" brakes and 3/4" front wheel spacers/ARP studs.