I've been tryiong to design and construct a cool air box for the intake for quite some time now. I had the basic design worked out, but hadn't gotten around to getting a piece of aluminum or stainless steel to make it out of. recently, I found a new material that might just work, and be quite a lot easier to work with. It's called coroplast and is a corogated plastic used to make signs. It just so happens, that I have quite a few sheets of the stuff lying around, so decided to experiment with it. It's easy to cut with a utility knife and by slicing one side, it can be bent easily. I used aluminum furnace tape to seal the edges and hold it together. I made mine topless with the hood forming the upper susurface. It's not perfect, and it's certainly not pretty, but I can now evaluate how effective it might be. Already in it's first test, it has seemed to be quite effective. I let the engine get hot sitting and then took it for a drive. Without the box, the temps hovered 25-30 degrees F over the ambient as measured comming in the mouth. With the Air Box, the temps are now only 12-15 F higher than ambient. I also noticed that while sitting the intake temps do go up, but they drop very fast once the car goes into motion.