DO NOT get deadener for the floor that is self adhesive!!! some day you will have to work on something, or weld on the floor pan underneath and removal of self adhesive sound deadener can be near impossible and very time intensive. I used Dynamat products on my latest project and used DynaPad which is thick with multiple density layers (much more effective) I even ran it right up the firewall in front, stripped the fiberglass insulation off some new firewall insulation backing boards and used the factory push fasteners through the DynaPad to hold it in place. This for the same reason - a place where future work might be done...