O.K., thanks a lot for the info--whenever I took the airbox off so I could see how much my headgasket was leaking I always saw that and wondered what it was for!

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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