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Originally Posted by optimuscivic
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O.K. I'll help you out. I actually bought one of these Vortec mods from this ebay seller. Basically, all you will be getting is a single resistor, two wires (a red one, and a black one), and an ABS plastic box which encloses (hides) the cheap resistor that they've hastilly soldered in there. Oh yeah, you'll also be getting a "Vortec" sticker which is stuck onto the ABS plastic box to again "hide" the single screw that holds the two halves of the "module" together.
You can find out more on how this "mod" works by going here:
http://www.speedmodules.com
You could get all the parts at Radio Shack for less than $5 (I know, I saw the exact same ABS plastic box there, it's called a small project enclosure). The only thing is knowing what value resistor to use for your application.
All this "mod" does is trick your ECU into thinking that the intake air going to your engine is colder than it really is. Cold air is denser than hot air, so the ECU will advance the engine timing and give the engine more fuel (richer mix) to take advantage of the "extra" air your engine is supposedly getting. What you get is slightly more power and torque, but you'll be burning slightly more gas too.
Oh yeah, the resistor that came in mine was totally wrong for my application. The car ran like cr@p after installing it, I had to go down to Radio Shack and get a much higher value resistor. Now the car runs fine with a little bit of extra power, and the decrease in gass mileage is so that I can live with it.
If you have a multimeter, or ohm-meter, you can actually measure the resistance across your IAT sensor terminals (usually in the 1000 to 5000 ohm range). Mine was 3.77 kohms (3770 ohms). From there, you can try and calculate what resistor to use.