Had this exact noise on my G. Started about 4-5 months into ownership. Thought it trans related. Sounded alot like a supercharger whine. Tried synthetic MT fluid which quieted it slightly (in my head apparently..keep reading). Whine was also present when turning the wheel while idling after driving the car a bit. Very similar to that morning sickness like noise that used to be common on fwd cars.
Eventually came across ITB12-035. This replaces the PS reservoir with an updated part. Had this performed recently. No more power steering noise at all, and no other whine which was identical to that shown in the videos in the OP.
The part is about $175 if out of warranty. Replacement should be fairly easy. Was in/out of the dealership in about an hr, test drive included. Good luck.
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G37S Sedan 6MT, Eibach swaybars, Invidia Exhaust, Weaker Clutch Pedal Spring
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