I just installed the GT500s on my '12 GT this weekend and I love the sound. It has the deep rumble I was looking for and the throttle is now a volume knob. When I first heard them, I was pretty much set on that sound, but spent a few months listening to clips online to make sure. YouTube videos hardly do any exhaust note justice, so if you can, try to find someone in your area with each and give them a listen in person. Good luck!
1968 Mustang Coupe /
2012 Black Mustang GT Premium Coupe
Black / Saddle, 6MT