Yeah!!!! That stupid thing!!!! I actually just went to look for the "spare" I had. Can't find it :-/ I don't recall now after 3 years if I'm running the avenir or the usdm AAC. I had questioned that thing 3 years ago, over and over! I remember trying both of them hooked up both directions for air flow. Neither worked. Maybe I'll try again? Is the AAC serviceable as far as cleaning it? Is it like the coolant temp sensor as far as if it is the Jdm AAC it won't work?