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I can say, my car has the sound proofing removed in the interior. Last summer, when the engine was out, I stripped my engine compartment with plans to not use a sound pad. I wasn't very happy with how the fire wall looked when bare and painted, so I installed one of Appbiz' pads. I couldn't believe how much quieter my car was to drive. I can drive long distances and carry a conversation without yelling now.
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