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You give them some information about your car, they write a tune file, load it on the tuner, and ship it to you. You then plug said tuner into car, push a few buttons, install your intake, and start the car with 25-30 more horsepower.
Just let them know all the basics. Your comp. code, your current mods. Do you already have the Jlt and sct tuner? If so, just order a custom tune file for $50.