Use Dynamat or not

Originally Posted by darkphantom

Sorry to pull this out from the dead, just took the Z on a road trip from Austin to Houston and there were certain roads where the noise levels were completely unbearable! I thought my hybrid was noisy because of the thin panels but the Z is VERY noisy on poor roads.

Good roads, it is very quiet, but the poor paven ones, the decibels are probably in the lower 90s+

So...I noticed that the rear of the car is particularly noisy, especially when raining. What other panels can I apply this to, to get rid of the road noise?