Just to follow up, BMW was able to pin-point the sound and repair it. I had a failed Sway Bar Link. They replaced both of them and the sound has gone away.
Edit: Scratch that. Sound came back on my drive home. Popping has returned, even with brand new sway bar links. Pulling a strut this weekend to get a good look at the upper mount. I've got a brand new one to install.
Last edited by spoolinX1; 05-23-2018 at 11:34 AM..
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