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All of those "performance chips" are garbage. They do not actually add performance, increase gas mileage, etc. Most are just a 10 cent radio shack resistor glued in a plastic box. They usually plug inline with the Intake Air Temperature Sensor (IAT) and trick the computer into thinking the air going into the motor is colder. This, in turn, adds more fuel thus giving you more power. In reality, its garbage.
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