UPDATE - SEE POST 11 AND 13
So I posted a poor quality video previously and figured I'd post a new video to show what triggers the sound and see if anybody has any ideas:
It will do this unless I start the car. It will NOT do this every time. It's random which makes it hard to diagnose
One buddy that works at BMW that saw the video suggested it's a DME relay or main power relay clicking but shouldn't be that loud.
I'm talking w/ the foreman tomorrow at BMW but want to see if anybody has any input. Thanks!