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The SF3 for 6.7L Power Flash arrives Pre-Loaded with DYNO Proven tune files that INCREASE HORSEPOWER and TORQUE! Programming your vehicle with one of SCT's pre-loaded performance tune files is as easy as 1-2-3. Simply plug the OBDII connector into your vehicle's OBDII port, select the pre-loaded tune file using the simple to navigate menu and within minutes the SF3 for 6.7L programs your vehicle.