ok, the IAT mod is for the V6 ATX cars, as far as i know. what happens is, the cars have this luxury shift crap, that cuts the gas between gears so it isnt a hard shift. what the IAT mod does, it cuts into the ground wire for the intake air temp sensor, so you can kill the sensor at any time. interrupting the ground to the IAT, will trigger a CEL, but along with that, it disables the luxury shift, so the gas stays flowing between gears. it shifts real hard, and real fast! i keep tearing the tires up between 1st and 2nd. the fast shift between 1st and 2nd, also helps the tranny, the less slipping between gears, the less heat! less heat = better! it also increases the line pressure in the tranny, and im guessing thats a good thing too! hope this clears it up! @-