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"Performance Chip", AKA "a resistor".
Scam-o-rama, all the way. Makes your fuel injection "think" the intake air is colder, so it fattens up the mixture a little. Until the O2 sensor sees that there's too much fuel, in which case it leans out the mixture again until it's normal.
In some cases, it may be enough to go "open loop", where the FI ignores the O2 sensor so you'll actually get that extra fuel all the time. Some extra fuel can result in a little teeny bit of extra power. More pollution and higher fuel consumption in that case, of course.
-soD
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