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adding weight in a lot of stop and go is definitely the last thing you want to do, but there is going to be a small difference. Compensating how you drive with the weight is easy to balance it out and make your number drop insignificantly.
BTW: If you haven't sound deadened before, note that chances are, the difference will be miniscule for actual road noise (if that's your goal). I don't remember where, but I read how you can actually use 1/4 the amount of total deadener for the same resonance deadening effect. If you are looking for road noise reduction, there are a lot of more effective ways (but you'd likely be adding more weight). If you are after rattle reduction, it'll help to a degree, but rattle hunting every hurtz is your best bet (long process).
(Used to be a huge stereo guy, ran a stereo shop for a while. Do a lot more home audio now)
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