air dam

Has anyone tried adding the full factory air dam on an FX4? I was thinking of seeing if I could throw the factory air dam from a non-FX4 on my FX4 to try to pickup a few mpg while commuting since I'm only going offroad a few times a year I could remove it as needed.

Just went through this with my 4x4 and had trouble finding good information on how to do it. The little air dams are optional, but I think it looks a lot better than the skid plate alone and directs cool air over the engine instead of creating turbulence around the tires. Parts to keep when...