I took apart my dash today, and put some cheap foam behind it where I could find empty spaces. I am hoping this will mute any rattles that I have coming from there. Its actually a twin bed foam pad. 100% polyurathane. It is nice and thick, but does anyone think this is a bad idea? Im thinking any sort of potential fire hazard, since our radios and DIN get pretty hot, but im guessing it wont be a problem in the back of it. Just curious.. i dont want to be driving and have a fire start in there!