I just notice a rattle under my car. I hear it everytime I hit a bump or pot hole especially in the front. I also noticed my steering wheel is shaking alot while on the road. I just had new cats installed 2 weeks ago.
i have the same problems as well, my steering wheel shakes if im going like 50 around a curve or brake hard. the sound coming from my car is more of a sqeaking though. when i go over speed bumps it makes a rubbing or squeaking sound. it is definatly coming from the front left area too.
Check the front swaybar links. I had similar problems on my 99 528i sport (pulling, noises when going over bumps or turns at high speeds). I replaced the failing swaybar links in the front and the noise and pulling went away. Tightness of the front end increased as well. Bavarian has the links for about $30. Check the support bushings for your swaybar as well.
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