I've got a '99 Z3 2.8 Coupe w/ around 80K miles on it. I've owned the car for about 2 years. About 6 months ago the right rear suspension area began emmitting a creaking/squeeking/rattling noise whenever I went over speadbumps, rough road, or if I sat down in the car when it was parked. This noise is very persistant and if the windows are down the noise is VERY audible. I can't figure out what's causing it. It isn't the spare tire holder. That's solid. Is it my suspension? Any thoughts?