Not saying anyone in this thread is wrong, but before you emulate what anyone else is doing, gather some information about what you actually need to acoustically silence body panels versus general sound deadening (ie closed cell foam). It will potentially save you hundreds of dollars as well as valuable time. Here is a site for a man who is an industry expert in sound deadening- http://www.sounddeadenershowdown.com/I plan on upgrading the speakers and adding some sound deadener at the same time I pull my door panels to clean and grease the window mechanisms. I will be watching this thread for tips.