Hushmat Complete Car Sound Deadening Insulation Kit 240Z 260Z 280Z 280ZX 510HushMat Complete Vehicle* or Floor Pan* Insulation Kits (*Choose from 2 options). HushMats complete vehicle insulation kits serve two important functions: reducing thermal transfer into your interior, and reducing the noise level by up to 15 decibels. Your engine, headers, manifold and exhaust generate tremendous heat that transfers to the metal firewall and floorforcing your A C system to work harder to maintain a comfortable environment. HushMat