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Sorry for confusion. Not the MAT sensor rubber plug. Let me clarify. The part in question is the factory rubber seal/gasket on the intake side of the MAF....|air filter > seal > MAF > seal (this one) > duct > coupler > throttle body|
Buckmaster - Roger that. Installed w/o the seal at this time. Yes, I noticed the notch as well. I'm just dumfounded as to why Shawn told me to re-use the seal in question. Perhaps, he misunderstood my question.
The install was tough....the new coupler gave me a very hard time. Very little space to move with Donaldson a/f set-up. Key is removing the rubber a/f housing rubber snubs/plugs when re-installing the whole deal. Can't leave them in there...and pop in the front of a/f....there is absolutely no space to lift over and pop in....Donaldson owners take note.