I used Dynamat in my coupe. Easy to work with, cut and stuck down really well. I'm happy with it and sure quieted things down although I don't have many road miles on it since the install. I found a good price on ebay and bought a box. I used it on the floor and firewall. I'm still looking for a review on using it or another product for the roof area which catches the heat from the summer sun. I've seen some other product reviews where the black goo between the reflective sheets seeps and runs when it gets really hot. Don't need that dripping on my old bald head.