Yea i knocked on it with my fist last time i checked and it sounded like the source. How much are the OEM cat's? and is their a cheaper after market alternative? I don't want to spend to much money on this car, but I plan on keeping it also. Do i risk damage if I keep using it like this? thanks

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My Cars
Mercedes CLS
Mercedes C-Class W203 - All time favorite

R.I.P.
Mercedes C-Class - W202 Lemon
Mercedes ML - Warrior
VW Jetta – Worst Car I ever owned - Alot of problems