Hi - in addition to what has already been said, RTV is death on oxygen sensors, and should not be used anywhere in the intake system, especially anyplace gasoline could contact it, as gasoline dissolves it in short order. Even a microscopic amount of fumes from it will kill the O2 sensor.

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Richard Wooldridge
'01 ML320
'82 300D 4.3L V6/T700R4 conversion
'82 380SL, '86 560SL engine/trans. installed
'79 450SL, digital servo update
'75 280C