Both cats went on the Range Rover due to the use of regular (87 octane) gas when it requires premium (93). [Before i purchased] I believe it is the same in the MB. When they went on the Rover, it sounded like the engine was rapping real bad.

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2002 Mercedes-Benz E320 4Matic
1995 Mercedes-Benz E320 Wagon
2005 Land Rover LR3 V8 SE
1999 Audi A8 4.2L quattro