When I carpeted my interior floor, I furst put down the sound deadner. It has adhesive on one side and aluminum on the other. But the "kit" only has enough to do part of the floor, which seeemd weird to me. So I bought the roof stuff to finish up the floor and do under the seat. I also bought the jute padding set. It's the under-carpet grey padding, just like in your home. It provides cushion and additional sound deadner. But like the other stuff they only give you enough to do part of the floor so I went to a carpet place with a small piece of what I had to match the thickness and bought more for like $20. I used 3M77 Adhesive to put it down. But before I glued it I ran wires for future speakers underneath it.
The padding that I bought from Brothers wasn't cut quite right... didn't even have a cut to allow for the break peddle! So it required a fair amount of doctoring to get it to sit right.
