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If I remember it sits behind the grill on the drivers side next to a vertical portion of the header panel by the rubber flap that gets moved to do the zoodad mod.
IAT1 is integrated with the MAF sensor just behind the air filter in the intake tube.. The sensor behind the grill supplies temp info for the EATC/HVAC system(Ext Temp).. Comparing these 2 against each other is a great way to see that expensive cold air intakes don't supply much cold air compared to a stock filter..