Well I tried my hand at making a homemade ram air set up. I used to sections of Spectre 3" flexible intake pipe. First driving impressions seem good. Throttle response seems little better, even after going into a couple stores and getting some heat soak, car seemed to respond the same, but also been driving the Explorer to work all week, so got used to less power. I cut couple slits into the lower section to let any water that would happen to get into it a way out. I can easily remove it if I don't like the results, but in theory it should work, car is getting more air.
http://s1290.photobucket.com/user/bamkmm91/library/SHO%20ram%20air%20setup?sort=3&page=1
http://s1290.photobucket.com/user/bamkmm91/library/SHO%20ram%20air%20setup?sort=3&page=1