I have taken my car to 3 shops after hearing a loud rattle whenever I take my foot off the gas. I replaced the cat. No muffler proffesional Ive been inspected by can figure out what it is. It is not the engine I am sure, the car still runs fine. THIS NOISE IS SO ANNOYING HELP ME!!!

Could be worn out exhaust suspension links... they are rubber which deteriorates. I had a similar problem no one could figure out; worn suspension meant exahaust was sagging and bumping something in the drive train... just look at them and see if they are cracked and worn.

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Don Drake

1990 300E 125k Miles
1994 S420 100k Miles