Originally Posted by JARblue

Because you'll get sufficient performance from the product without the need for full coverage on just about any panel you would encounter in a vehicle. Once you get to a certain point you are just adding unnecessary weight to your vehicle with negligible increase in vibration reduction. If that point is not sufficient noise reduction for you, the next step is to add as much CCF as you can fit/afford. This is where you will really start to notice noise reduction because the stuff actually interferes with the sound waves to reduce decibel levels.

I'm sure you know all this stuff. You're a car audio guy. To be clear, I don't think I ever said dynamat was entirely unnecessary - just that full coverage of the stuff on most panels is unnecessary. If your car is already mostly vibration-free, then very minimal dynamat is necessary. I'd imagine most people would probably feel that more is needed in the Z than the average car. I did my hatch in its entirety; I think I could have achieved essentially the same results with 1/4 of the product strategically placed in the hatch. That amount I used in the hatch should have been enough to do the entire car.