It greatly helps with the exhaust droning and road noise, Civic = almost non-existant sound proofing. it gives the car a ore solid feal, reduces virations, creates a better car. Sound and Thermal insulation are the only real differences between a top end vehicle and the cheapest in the line-up.
BUT, there is a huge issue with Dynamat, it traps moisture and creates a rust oven between it and the metal body panels, and it is SUPER heavy! For far less money and far better results, the LizardSkin Ceramic spray-in sound and thermal insulation wins HANDS DOWN ! ! !
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