Dynamat..Worth it ???

Guys.........

In my Dart Sport 360, I have a stock black carpeting with very little actual insulation......just some thin fibrous mat, and spotty at best....not form fit like the carpet.

I get a LOT of road noise, and the exhaust is LOUD in the cabin.

If I purchase some good Dynamat (or whatever the stuff is called exactly) and form fit it on the whole floor and up the trunk divider, then reinstall my carpet, how much actual difference can I expect in the cabin as far as NOISE ??