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Something to keep in mind. The deadening material that is attached to the sheet metal is simply vibration dampening. It is not there to block noise from entering the car, and is not dense enough to be effective at doing that.
The noise insulation in the car is the carpet padding, and in some cars the heavy vinyl/rubber and foam backed sheet that covers the firewall. To block sound, you need dense material.
The deadening in a 1996 dodge neon weighed 32 pounds, including all of the asphalt based deadening, the carpet padding, the firewall mat, and rubber hole patches that keep noise from the frame rails from entering. It will take several days, a heat gun, and scraper to get all the asphalt deadening out. If your lucky at have a butyl based deadener, you could dry ice it, and tap it out with a mallet.
Your engine noise will increase, especially with the windows closed. The closed environment will create a resonant chamber, that will drone at whatever speed your engine reaches the resonant frequency of the car.
I'll never remove sound deadening again for weight loss, unless building a strict competition car.
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