I probably won't buy dynamat cause it's WAY to expensive, but you get the idea. How much sound deadening material would I need in a '98 Grand Am 2 door to make a difference?? I would like better sound quality and less road noise. I was thinking of getting 50 sq. ft. Will that do or should I purchase more?? Or, is there any alternatives besides these expensive materials?? ie. dynamat, brown bread, edead, b-quiet.