Okay, let me wake this thread, I'm going to add some sound deadening material to my car, I checked out A&B sound, they've got something that's call Hotmat noise killer, I have never tried any sound deadening material and I have no idea how good these are comparing to the Dynamat. As those of you said go to Home Depot for sound deadening material, I was never be able to find them at Home Depot. Which home depot did you guys go to? hehe... Thanks guys, BTW, those hot mats are 39.99 for like 17"x33"! D*mn expensive!