just remember not to use the silver "bubble" type on the floor or trunk floor,this type can tend to lose air under even the repeated pressure of your feet-which makes it lose all of it's insulating properties! I like to use the self adhesive lead septum foil type on the floor (cool-tech,dynamat-ect...) and the cheap bubble type on the :quarter panels,inner door panels,and roof panels. Remember:any insulation will help better than none at all,but areas of high heat-firewall,floor above close mufflers,ect. will respond to an insulation with a reflective surface like foil-mylar, and an insulator like fiberglass or lead septum type.shop around,there are many different manufacturers making the same product and just pad printing their logo on it! And, don't spend the money on the "special" aluminum tape for the seams of the insulation on the self-adhesive type,just go to home depot and buy the aluminum foil duct tape for 1/3 the price! it' the same stuff!