Get the quads. $693.00 and they look and sound great.
Ford Racing Shelby GT500 Mustang Rear Valance & Exhaust Kit M-5230-MSVTCD (13-14 All) - Free Shipping
I look at toll roads like Strip Clubs, just bring a pocket full of dollar bills and all is good. In Houston they will let you slide the first time if you're not a Texas citizen..