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!!!!
'05 TJ Unlimited. Black, 4" Superlift. Warn M-8000, Homemade Disconnects, Homemade In-Cab Winch Controller, Homemade S-Pod, DIY Rokmen Front Bumper, Homemade Rear Rock Crawler Bumper, 32" x 11.5" BFG MT's, Lockrite on the front D-30, Onboard Air