I took a video of the sound/noise. Doing the actual filming made me analyze how the noise appears all over again. [sadly the audio quality that my smartphone produced wasn't good enough to pick up the noise ]
The noise can not be heard when car is in park and the engine is rev'd, inside or outside of cabin.
The noise is not directly linked to RPM. If I coast at 2-3+ RPM the sound doesn't exist.
However, if I push the accelerator, while RPMs are above 2k, while driving, then the noise appears. I can make the noise come and go as I push and let go of the accelerator above 2k RPM while driving.