From their website:
The KD-Box is a highly convenient tuning solution as it is fitted only by cables and plugs with no need to open the engine control unit (ECU) or to replace any components. The KD-Box is adjustable and can adapt to the characteristics of the individual engine, ensuring a perfect power curve and at the same time preventing overload. In addition to the increased levels of power and torque (up to 25%) the KD-Box provides a sharper throttle response for maximum driving pleasure, and has been shown to improve fuel economy in many cases.
Translation: It's a module that plugs into the fuel rail sensor which "tricks" the sensor by telling it that needs more fuel, more pressure, more power.
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