It turns out it's more than worn bushings and ball joints. I had previously had an "opportunity" to replace the front subframe, it looks like now I get to do the same for the rear subframe.

It looks good on the surface, but you can easily push it with a finger and see the upper bushing brackets flex where corroded.

I'm waiting on a replacement from LKQ. I do have a quick question on the rear subframe bushings. Can I use a generic tool since it's going to be out of the car? Or should I 'invest' in another tool?

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2001 E53 3.0i
2012 E70 xDrive35i