Do you live in a place where there is emissions testing? If so, you'll need both the air pump and the vacuum retard to work properly. If you don't, these items could fall off the car -- so to speak -- and your vehicle will run fine. (Vacuum retard is just that ... retarded.) Just make sure everything is plugged properly so there are no vacuum or exhaust leaks.
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'01 SLK320, '79 450SL & '01 C320 -- What? 3 Mercedes? I am DEFINITELY crazy!!!
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