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Increased HP and Torque. From the factory the manufacturer programs their vehicles to cater to the needs of the daily driver not the performance enthusiast. After loading a SCT pre-configured strategy tune even a bone stock unmodified 2007-2009 6.0L Chevrolet Silverado will realize noticeable gains in horsepower torque and fuel economy. Increase your mod’s potential. Factory computer settings are calibrated for the original factory components. When making performance modifications you need to recalibrate the vehicle’s computer to realize the full potential that these modifications can achieve. Compact Design. The Sf4/x4 Power Flash Tuner measures in at 2.7wide X 5.5tall making it much smaller than the original Sf3/x3 for easy storage in your center console or glove box. The cord is detachable and there is no battery or power supply needed. It uses the power from your vehicle’s diagnostic port or computers USB connection. Full Color Display.