I have an o4 1500 QC 4wd 4.7L also. 5spd. Manual. I have the entire AirAid system on mine. I also had the AirRam resistor in the ATS circuit but took it out as my mileage dropped. Probably made it too rich for the high altitude where I live.RaiderNick said:I guess what I'm wondering is, except for a few more parts, what are the design differences that account for the difference in price? I have an 04 QC 4WD 4.7L.