And folks are apparently already hacking their in-cabin sounds to sound like higher-performance models! (cf. http://jalopnik.com/someone-hacked-their-bmw-m135i-to-sound-... )
The 2015 Mustang with the turbo 4 cylinder has a similar system but the functionality can't be deactivated or tweaked in any way. Can you imagine the frustration of listening to the acoustic meddling through a blown speaker that you can't disable? I had a Lincoln Mark VIII where the stock amplifier fried itself when I was on the highway. It blasted static with wildly varying pitch at full volume for 5 minutes before I could safely pull over and pull the fuse. It was literally maddening.