[dizman7]

When I took mine it to have them check out the tin can ping noise in the back wheels they mentioned something like what you described as a known issue from BMW.

I don't remember most of the info he told me (since it wasn't the issue for my car) but it was something about a noise from a wheel(s) but only under sharp/tight cornering. My issue was different but they even had me test for this issue but driving in tight circles out back of the dealership.

If you can reproduce the noise (I couldn't for my issue cause it's random so they couldn't do anything) I'd take it to the dealer and see if this is the case, they should have a bulletin about it.