Laid in the HushMat. It comes in 12x23 inch sheets. I found just a few places where a full sheet can be placed easily. Cutting it to small pieces worked best in most places. Lots of overlapping is inevitable (it takes quite a lot of time anyway without cutting exactly!), reminded me or paper mache class in grade school art class. Who would have thought that would ever prove useful
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I used the handle and blade of a putty knife to press the mat to the chassis, no need to buy a roller tool.
I bought the big package of HushMat; #10500. This is 30 sheets and 58 square feet. I used it in the under wiper motor area, along the sides behind the dash, behind the door kicks compartments, tranny tunnel, entire floor boards, and rear seat area up to the seam that runs through the middle or the forward trunk panel. I have just 3 sheets remaining that I plan to use on the door panels.
I bought 6 linear feet of Reflectix insulating mat at a hardware store to line the tunnel and passenger feet area. I will re-use the cut closed cell foam pad over the Cat area of the passenger floor.
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