I have a 2011 5.0, currently considering trading up for a new 392. Just want to point out, the whistle in the last video could definitely be from the '11 GT - even the stock intake, when recording from the front, sounds like a turbo whistle at high RPM; with an aftermarket intake, the sound is even more prominent. Just a theory, but, it could be because the factory 'cold air' pickup tube in the front bumper is such a small diameter - it might be causing the high pitch suction sound.