A while back there was a company called "Banshee" that made a functional hood scoop that fed an air box with a conical filter. It was originally designed for Rangers, but they were supposed to be adaptable to the Explorers, and they were considering a kit especially for them. I will look into my files and see if I can get you the particulars, or you could do a search for "Banshee" on this forum. It was only a few months ago, so it shouldn't be too hard to find.
Telford