Well what's a bit weird is if you watch the video again, when the 599 creeps past when still inside the valet area, the exhaust seems to 'blare' a bit, all of a sudden. Not sure if he just presses the sport button or whatever, I don't know what setup there is on the GTO (or Aventador) but it's possible there's a bimodal exhaust setup like the current Maseratis. So in normal running mode it'd be just under 90dB up to the test RPM, above that the valve would open. In sport mode the valve would always be open regardless of RPM?