I just purchased a Edge Evolution CS for my 04 F150 4x4 5.4l, works great, and noticed the difference. I am going to further upgrade the drivetrain on the truck, and was wondering if anyone knew what would be the best combination for my programmer. I want a CAI kit, and American Thunder Exhuast, then I would like to add in Gibson Headers, and an electric fan kit. My real confusion is with the CAI kit, Edge recommends if I upgrade the CAI kit I need to upgrade the programmer, at www.powerhungryperformance.com which is fine I can do! But I would like to get the best CAI kit for my buck and recommendations?