<imagine me giving you the side eye right now>
Did you leave a "1" off the front of that number or hit the "4" on your number pad when you meant to hit "7"? That giant blower on there and you're only putting down 420HP at the wheels? I ain't believin' it.
Indy... it isn't loud at idle but sounds good while driving. It's catless so about as loud as any other mustang. Just hard to hear much over the blower.