ZR1,
I have only driven my car with the sound deadening in place, but I have ridden and driven in other Panteras. There is a noticeable difference in the lack of high tones coming into the cabin. My car has a big block with open exhaust, but I only get deep bass notes from the engine. When you knock on the roof with your knuckles it sounds completely dead.
I have also applied Dynamat to the doors, firewall, floors, etc. It is like being in a bank vault.
Sincerely,
Matt
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