RE: Where is this IAT sensor
IAT is the "incoming Air Temperature"
It works...if I would be you I would buy a PowerWire from Air Ram which is the same thing but "plug and play"
On the stock Air box it is somewhere on the underside of the box, don't remember exactly where it is.
It is maybe a 1/2 diameter plug with 2 wires coming out of it.
If you install the resistor wrong you can fry your PCM!