AC, so in your opinion, the GT500 is a worthwhile good upgrade, with the sound being deeper. And also you video was very entertaining.
Oh yes, just the GT500 Mufflers are very worth it, the video doesn't represent the reality that well, the sound is totally awesome and nothing close to the stock Mufflers; they're really worth it and I love it!
I would recommend them to anyone! The tips are bigger (4") makes the rear end looks meaner, and the sound is just a thrill, I find myself not listening to the radio more often than before, just to hear that rumble!
Plus, these are Ford Racing parts, so I'd rather stay with what's factory for the warranty and even for being stock on the GT500; I don't want to turn my Mustang into a tuning cruiser...
The good thing with these Mufflers, is that you have the nice rumble at low speed, the deep sound when you step on it, but then on the freeway on 6 gear, they're not that loud (almost as stock), so you won't have too much noise when driving long distances on the highway; that's of course if you don't step on it...
As you can see, I don't regret 1 second my purchase.