Dynamat and similar products do not really mask sound - they really are only for keeping a panel from resonating. In the case of well corrugated floor panels I'm not sure they are doing that much for us - they are much more necessary on door panels and such that have large un-braced flexible sheet metal. The trend in car audio is to use only a smattering of panel resonance (dynamat) type products usually no more than 25% coverage even on door panels (worst case).
to truly block noise requires complete coverage by a mass loaded barrier usually MLV. Good news, its easily removeable - bad news it weighs even more than dynamat.
Check out SoundDeadenerSolutions.com for the full skinny.
I think we in the muscle car community out of sheer desperation have probably been way over using dynamat. That being said I often go for pretty full coverage as well just because I will do anything to quiet my car down.
Of course dynamat will never tell you that. Their other products that are designed for noise transmission are good but again the enemy is weight.
Once you have stopped a panel from ringing, you don't need more dynamat unless you want the thermal protection, and there are better products for such.
What happened to that bad ass '69 Camaro that Rodger was building ? I thought that was the successor to this car ?
I have fully dynamatted my '92 Cadillac and my 2003 Dodge Ram and the difference was minimal, maybe 2db at cruise after a lot of work. Its surprising how little factory sound deadening there is on the panels and I think this is whay, most of them are pretty "corrugated". But, there is a lot of foam and deadening pads, and again this is becuase they absorb and deflect noise whcih dynamat type products do NOT.
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