It shouldn't make your car TOO much heavier. Just go to the store and pick up a roll of dynamat. The weight of the roll in your hand should be the same as the weight of your car. Besides you would have to spend a fortune to add 100lbs of dynamat to your car. Also, if you are worried about rattles and squeaks, putting dynamat behind your door pannels will not get rid of a rattle behind your dash. So, to make a long story short...get the rattle fixed, then dynamat your car, and your stereo will sound better and you won't have quite as much road noise.
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