The liberal use of sound deadning like Dynamat, Rammatt, Second Skin plus a layer of ensolite acoustic foam over the top of the sound deadning will make a dramatic improvement in reducing road noise. Plus if you modify your car like many of us do with performance exhaust, intake, ect. The sound deadning will reduce or eliminate any drone from inside the cabin.
Now the benifits of sound deadning for audio are of course the obvious lowering the noise floor. Speakers are mounted to the metal in your doors and sound deadning will help by reducing if not eliminating resonance. Metal doors are not idea for speaker enclosures by any means so sound deading really helps reduce any resonance. Resonance will dramatically reduce bass performance and color midrange.
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To the optimist, the glass is half full. To the pessimist, the glass is half empty. To the engineer, the glass is twice as big as it needs to be.
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