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will improve the sound to you. Noise is most efficiently dissipated with both absorption and diffusion. Some other material would likely provide a better mixture of both with possibly less of a penalty in weight gain. Dynamat does a surprisingly good jobs when you simply apply it to the inside of a panel (door for ex) directly opposite of the speaker. This changes the reasonant freq of the door panel, ridding you of the metallic reasonance you'd likely have from the metal coupling with the speaker. I personally think it is best used for that purpose (kind of quick and dirty). For an overall treatment, other materials should do better and likely for less. If you've ever examined autos sound deadening material, you'll find it to be a more porous material with a rubber backing similar to the dynamat. This way you get double the absorption of the thickness of the material. Sound first travels through the porous material and a portion is attenuated there, then it hits the harder backing of the material and that which isn't absorbed is reflected back from where it came. This second trip through the porous material also absorbs some of the resultant energy (sound). When this material is against a hard material like metal (such as your floor pan or fender, etc.) this volleying back and forth occurs, absorbing a little more with each reflection. The key is to have a good enough backing that doesn't allow sound to pass through. With this in mind, many times you can increase the deadening of what you have by simply taping the seams where the factory absorption panels have been installed. The Z does have nice insulation in it compared to alot of cars. But more is better as far as deadening goes.
Regards
Sweep 
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