I don't have an SVT, so I can't speak from first hand knowledge, but the audio diffeneces are negligable. So here goes my answers;
1) There is an how-to on removing door covers
here. 2) Sound dampenind material in the doors will have a very mild effect on dampening road noise. They will help your speakers to perform better, and therefore make it easier to drown out the road noise.
3) There doors already have speaker wires, so all is needed is to run speaker wire up to the door.
The firewall already has wires running through it, and an amp power cable can be piggy-backed through one of those existing holes.
Depending on the size of the amp, there is room behind the glove box. Other populaur spots
include under the passnger seat, on the rear
seats in the trunk, and mounted to a subwoofer enclosure (if you have one).
Hope that helps some.
