I have a 2007 WRX with leather interior. I have this noise coming from the rear deck area above and behind the rear seat back. Sometimes it sounds like a rattle, other times when the car has been sitting out in the sun it sounds more like a rubbing sound. It is really noticable on rough road surfaces, and at speeds under thirty. I have torn out the rear seats and looked under the deck cover and found nothing. I thought it may be the ball in the rear seat belt retractors but now I don't think so. I took it to the dealer and they had it for a week, tore it apart also, but no luck in finding the noise. Anyone have any suggestions.