So I did a little research. This "chip enhancer" is just a resistor that connects to the IAT. It fools the ECU into thinking that cold air is entering the engine and adjusts the air/fuel ration to accomodate. After a while, your ECU will figure it out and ignore the IAT reading and lean the engine back out.
$69.00 for a .20 resistor you can get at Radio Shack.
I would say it is a RIPOFF!!!!
89 YJ, 4.6 Stroker, SOA, Waggy 44 and Ford 8.8 w/ARB's. Rollin 35" BFG's. Raptor Lined Body.