Did you check the control arms for wear? You should put your car on a rack and check the suspension... I had a similar issue in two different BMWs; 540i/6 and X5 4.4. My suspension would pop and when making turns at parking lot speeds and over speed bumps... sounded horrible and pedestrians would turn to see what was making that horrible noise.... I understand it is a common BMW failure at +/- 90k.

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