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Taping down foam wont help much.
If you are going to buy someone's "dynamat like" stuff locally you might as well get it where he does, Lowes/Home Depot. Called Ice Guard or something along those lines. Basically its an adhesive backed rubberized asphalt with a thin layer of aluminum on top. Its to thin for car applications but some people swear buy it...
In the Alero the best sound dampening you can do is under the rear seats and around the rear wheel wells. I did the entire car to the front and it made the car a LOT different. Took a long time to do also!
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-Ryan
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