The first step in any automotive sound deadening project is using a Constraint Layer Vibration Damper - CLD. Apply one of our foil backed CLD sound deadening mats to automotive sheet metal to destroy resonance that leads to unwanted road, engine and exhaust noise. Per square foot our Damplifier mats give you more sound deadening material for your dollar than any other auto insulation company out there. When it comes to constraint layer damping mats,; nothing compares!