Dynamat is only for noise abosorbsion like the old fashioned heavy asphalt pads our cars came with.
These days there are lots of high tech products from spray or brush on coatings to specialty companies that make pre-cut floor pads for our Firebirds that are both absorb sound and heat.
I put on 3 coats of a product called VB-1X from Cascade Audio. I saw somebody use it on their Pro-Street GTO. Besides abosorbing sound (it is also used for speaker enclosures) it puts a permanent coating on the top of the floors and they ain't ever going to rust again.
Then I saw pre-cut pads from Quiet Ride in Hemmings Muscle Machines. They block both heat and noise. www.quietride.com
Then I have seen others purchase the sheet aluminum backed jute pads from home improvement places and then cover their entire floor with that. I did a truck cab that way and now that I know better - I'm getting the Quiet Ride kit for my 'Bird.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
