I definitely do not know how to install different parts on my Expedition. Really, all I can do is change the tires and oil. Beyond that I am lost. However, I realize that some of the after market parts are worth installing. I realize that most of you all will be able to install these on your own, but I would think that some would know where to go to have them installed if you are unable to. Specifically, I am talking about a cold air intake, but I am willing to do more in the future. Does anyone know where you could have this done?