The interior of a GT Premium fastback in Race Red with leather-trimmed interior in Ebony is shown on this page of the 2017 Ford Mustang sales brochure featuring the audio system. The text reads, Rock the Cockpit. Listen to everything you love with SiriusXM Satellite Radio. Get over 150 channels including all kinds of commercial-free music, plus every major sport and the best talk, news, comedy and entertainment. And you'll hear it all with a 6-month trial subscription to the All Access package, included with your new Mustang. So you can rock your ride, plus listen anywhere online and on the SiriusXM app. Amazing sound is yours with the 12-speaker Shaker Pro Audio System featuring HD Radio Technology. Broadcasting a digital signal over traditional radio frequencies enables HD Radio Technology to offer up to 3 additional channels of new, local content per FM station. It can also display the artist, song title and more. All without any need for a subscription.