First, a little info on sound deadening for all reading. Products such as dynamat and edead v1 and v3 are products that deadened sound (rattles) by something called mass loading. All metal and plastic panels in the car have the potential to resonate / vibrate at certain frequencies. By mass loading, you are effectively adding weight to the material, trying to make the metal or plastic have a higher resistance to resonating. This type of sound deadening is best used with bass / subs, to prevent rattles. Although mass loading does limit some road noise / high pitched wind noise, this is just a slight consequence and it is very ineffective at it. This is where foam sound deadening comes in. It effectively absorbs sound waves. Closed cell foam is better than open cell foam because it has a higher resistance to mold and mildew.

As for what I did...for the doors I installed mass loading on both the inside and outside panels. It is a little hard to reach up and get the inside door panel, but it is doable with the windows up. As for the closed cell foam, it was put in select spots on the door, behind the speaker, and a second layer was added over top the factory carpet that covers the large gap in the door panel. The carpet is applied to one side of the vapor lock plastic sheet, I stuck the closed cell foam on the exact other side.

As for other locations, the floor of this car has very thick padding already, so I saw no need to apply any there. I did pull of all of the back panels and carpet around the gas tank "hump" On the gas tank hum, I applied one layer each of dynamat and closed cell foam. In the rear, I covered everything especially the floor with three layers of edead v3. I also applied edead v3 to the metal inside the rear top back panels. These panels are a pain to take off, and even more of a pain to put back on (at least in my opinion as I broke some clips trying and need to go replace the clips).

given that I had all the panels off and the a pillars, the headliner seemed like it would have come off very easily as well, but I was out of sound deadening material and did not apply anything to the top.

Not sure if this helps, but let me know if you have any more questions. The car is very quiet with this, and with my speakers, and 10 inch Alpine Type R sub, there are zero rattles.