so I got the car back after working with a BMW technician on finding the source of these weird noises. We removed the exhaust and all the metal covers that surround the e-brake cable and drive shaft. There was no visible wear or indication that the drive shaft was hitting the e-brake cable as the service bulletin had stated.
We put all the parts back and tightened everything but the noise came back after driving for a few minutes later.
Honestly, its annoying and very frustrating.
PLEASE...if anyone has an idea on this "metallic" noise coming from the rear...chime in!
