I took delivery of a 2008 550i w/ sport package in August 2008. Almost immediately, I noticed a noise when I would steer the car hard to the left or right. The car has been to the BMW dealership in excess of 6 times. The noise can not be reproduced, so I am told. I have been on drives with the shop foreperson and BMW engineers. The car will make the noise once but they tell me that since it only makes the noise once and they can not reproduce the noise the car is fine. BMW NA has requested that I sign a release in exchange for $1000. I have refused to do so. Any one with a similar experience?