Sound Dampening

[fmichael2]

I want to see if I can quiet down the interior of my WRX wagon a bit. I was thinking of putting sound dampening in the doors...

Is there anywhere else I should put it?

What kind should I use?

[Cyanolum]

http://forums.nasioc.com/forums/showthread.php?t=375468
http://forums.nasioc.com/forums/showthread.php?t=864404

Doing the cargo area, the doors, and the headliner will help a good bit. The tar or rubber matting dampens vibration, and the foams actually dampen road noise, so you'd need both to do a good job. Anything that is actually rattling will need to be fixed the right way, tightened up or taped/glued, to stop the rattle.