I used the Dynamat in my '56 straight axle gasser wagon. Not sure if it was actually Dynamat, but a very similar product. I did the passenger compartment floor and even the inside roof before the headliner went in. Mine came with a roller. Easy enough to install. I don't think it affected the fit of the carpet. Now, does it keep heat out and allow less noise inside??? I don't really know. I have noting to compare it to. Like a before and after. This car generates alot of heat and noise anyway. When I open up the headers, it's all a moot point. I suppose on a more normal car, it might help with these issues. I would use it again and actually I did. When I recently gutted the interior of my '71 GTO, I put some down on the floor pans and associated area's. Again, I have nothing to compare it against, but in my mind, I think it works. I do believe "Dynamat" is a brand. Shop around for a similar product that you'll find much cheaper. Sorry, I don't recall what I used, but I found it on line, Carmine.