my.02
not on the floors as it may trap water and cause rotting
do a search on the subject.
'''My question is, should I use the peel & stick to replace the firewall pad?
no, you'll regreat it if you need access back to the firewall
Where else should I use it? Along the back of the cab wall, in the doors,
yes
under the floor mat and under the seats?
no
Would I be better off to get the exhaust exit rearward? ''''
yes
I use DYNAMAT on the doors, roof and back panel. i use a jute material and two sided foil backed padding on the floor and under the seat compartment.
http://s67.photobucket.com/albums/h298/1951otter/?action=view¤t=001_1.jpghttp://s67.photobucket.com/albums/h298/1951otter/?action=view¤t=DSC00492_0008.jpgi think they work great on the inside of my garage roll-up doors