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Yeah these things are bad news. Believe it or not, most of these "Chip" mods are not a chip at all but a simple resistor. Sometimes the clowns go so far as to disguise the resistor in some sort of chip-like package. Here's the best part, you hand wire the thing into the harness that has as the Idle Air Temperature Sensor. So the resistor is basically fooling the ECU into thinking it needs to richen the fuel mixture and adjust timing. The power gains are negligible. And you do risk increased engine knocking, etc.

To conclude, the Chip-Mod should sit on the shelf next to the Electric Supercharger and the Fuel Line Magnet.
 

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If you're going to get one, spend the $$$ and get one from a reputable tuner.
 
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