Very timely post,,, my wifes' 02 E320 has a rattling cat,,, with 5 K still under warranty. I just made the appointment at our dealer.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K