I went for another drive today I do think it made a difference and definietly in the heat department. Much cooler around the feet and its in the 30s today.
This is the first time at doing this and haven't used any other product. I did tey some silver tape with some kind of black stuff on the back to seal up the joints, but it didn't stick anything like the Dynamat. As long as the surface is clean and the big chunks removed, it'll stick.
They were sourced from Scat Procar direct I believe in the US.
I've invested in a quality stereo and have spent my life listening to engines, the music wins this one.