I replaced my old torn up heat shield with a "home made" stainless pair. I made two pieces that have the same shape except one is about 1/2" to 3/4" longer on the bottom side. Using a sheet metal brake, I slightly bent the extra on the bottom of the long sheet. I then mounted the two sheets in the car with a washer in-between them to create an air gap. The way I have theorized this set up is that the rear sheet with the bend (closest to the muffler) will force air moving below the car up through the gap and out the engine cover. So, yes the sheet right next to the muffler will really heat up, but the second sheet on the other side of the air gap (and next to the belts) will remain cool. I have been using this for just short of a year without any noticeable problems, but I am unsure that it works exactly as I have theorized. But when you look at the rear of the car, it looks really good hanging down like it does. Sean Howley VIN#2345