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it is that big filter thingy that attaches to that tube that runs to the throttle thingy that attaches to that big black thingy that sits on top of your motor
LOL....as you can see, we all have a sense of humor in here.
I think your best bet is to search the internet. There are a few good articles out there that explain the CAI's. Your gonna learn that the aftermarket CAI's for our cars, are not actually CAI's. (although, the tuners like to call them that anyway)