Man, some of you guys put entirely too much effort into the heatshield. No matter what you make it out of, its still going to be sucking in warm air from the engine bay unless you totally seal it to the fender opening. Whether its plastic, aluminum, reflective, abrasive, transparent, neon or whatever, thats all a moot point IMO. The main goal to me seems like it should be to block off as much air from the engine bay as possible. The cheap and easy heatshield: plastic trash and foam pipe insulation. Extend the sheild as close to the fender opening as possible and run a hose from the front grill to the filter for a little extra cool air. Trim the top of the filter a little at a time until it fits snug to the hood and add the pipe insulation.
