Kind of an odd question here I guess, but I've always wondered: What gives the GT such a distinctive sound? It sounds like no other 5.4 Ford V8. Even the 13/14 GT500 which uses the GT heads doesn't sound close. The GT has such a deep, rumble-y roar, especially with a nice exhaust system. The Ford Racing long tube headers make these cars sound like absolute monsters. So guys, what's the secret to the thunderous exhaust note?