High pitch noise coming from passenger side

spearfish25

Guys, EVERYONE has this noise. There were many threads about it a few months ago and it seemingly died off as people either 1) got used to it or 2) changed their exhaust which probably drowned it out with the louder exhaust note. The noise was described as a high pitch, electronic sounding whine that is difficult to localize but appears to be coming from the engine bay.

I too frequently hear the noise but fortunately it doesn't bother me as much and has just become a part of the car for me. However, I'd love to hear what's causing it and have it changed if possible.

From the original threads about this, G37 owners claim to hear it as well.