I have 'dynomat' in my proton, but i tried 'damplifier pro' and 'luxury liner pro' in my 73 Challenger and THAT STUFF is Awesome!!! It's a two-layer process so it does take a long, long time to install but it's great. It's made by a company in Arizona called 'Second Skin'. I got 25% off since I'm going to advertise using their stuff on my car show posters for the challenger. Great guy to deal with too!