Thank You so much!
My subwoofers are only 10", they look a bit bigger because there is this aluminium circle for "show".
My car audio is adjusted as "hifi". I'm not looking into power or loud voice, trying to hunt a clean voice with speakers. So far it's quit good.
But the Dynamat is a great stuff, it's easy to work and you get a good benefit of it.
PS. you got an awesome ride too, in my country the price of that new Mustang is crazy. Never can afford to it