The extreme bulk pack has 9 pieces in it. You'll need atleast 4 to do the floor. Basically, one piece in each quadrant. Figure one piece in each door and that bring the total to 8. I recommend you cut the last piece in 1/2 and use the 1/2s in the front doors again, because they are larger then the rear doors, and have a speaker in them. I did the outside skin in mine. Later, I'm gonna get another extreme kit and do the metal under the panels. I also plan on using some dynashield in the wheel wells and d'matting the rear 1/4 panels inside and out.

I love D'mat, and you can't ever have too much IMO.