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Old 08-18-2016, 10:49 AM   #6 (permalink)
basjoos
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Aerocivic - '92 Honda Civic CX
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Since coroplast isn't dense enough to be a good sound proofing material, the "road noise" reduction you are hearing is the reduction in the amount of wind turbulence under the car. A large portion of "road noise" is actually wind noise generated underneath the car.
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