I used Second Skin when I redid my interior about 3 years ago. Damplifier Pro on the floor and doors. I used Heat Wave Pro under the headliner. I do not have AC in the car and the temp difference in summer is remarkable. I'm sure there is some noise reduction as well, but with the windows down, who cares? The doors are not tinny anymore and sound more "solid" when I close them.
The doors are not tinny anymore and sound more "solid" when I close them.
