Please check out
Second Skin, since they are a
sponsor. I've used both their stuff and eDead from Elemental Designs, and I can definitely say Second Skin seems to be higher quality. This is coming from a huge Elemental Designs fan, having owned many subs, speakers, and an entire 7.1 setup in my living room.
You can check out my DIY guide that I made while installing Second Skin here:
DIY: Sound Deadening The Hatch