Our HushMat 1970-1974 Challenger sound deadening kits are designed specifically for each year break to provide sound deadening for the entire vehicle with the exception of under the front hood. Our Challenger sound deadening kits feature the HushMat ultra material which is used to cover the floor, firewall, doors, trunk, roof, and tunnel. HushMat is the only sound deadening material on the market that is approved by the SAE (Society of Automotive Engineers) for use in new vehicles. HushMat will maintain its adhesion, sound deadening, and thermal barrier from -30 to 550 degrees Fahrenheit. Our Challenger sound deadening kits do not require any harsh chemicals for preparation. The HushMat ultra material cuts with house hold scissors and you simply peel and stick it on your Challenger.