I heard an integra once that had a full dynamat job done, was utterly impressed with the dampening it did to it and would kind of like to have that done as well. however, i need to consider the weight it could add. i've already got a sub box that's pretty heavy (and thinking of going stealthbox on that) so. how much does it really affect the road noise diffusion? my real reasons are more for the audio system clarity it could add but if it helped the road noise that would probably put it my decision over the top to get it done.