i have my hatch front doors and front half of the roof done with dynamat, mad a huge difference. all with just a single layer. i did the front half of the healiner because the map light and roof were getting annoying along with the doors. helped keep done ratles upfront for better sound upfront. next is the rest of the trunk and then the rear doors and last half of roof.
hn155: Rockford punch pro speakers, t400.4 deh 80prs, full audio build to come. working towards 175hp n/a, simple but fun.