Doing the kick panels up front cuts down lots of noise. I used dynamat for that too. There is no sound insulation material there. I also pulled off the rear panels where the speakers are located and use the dynamat on the metal of the wheel arches.

Regarding the kick panels...do you mean under the footwells infront of the seats? Or taking off where the illuminated kick plates are..or both?

In my previous ZR I peeled back the carpet and put sound deadening under the front carpet in front of the seats. I did not do behind them as that was a big project in the ZR due to the top.