Hey - my mom just picked up her Murano about 2 weeks ago and she loves it...probably not as much as I love mine though Anyways, if her back windows are down, there is a pretty loud machine gun/helicopter type sound from somewhere in the back. I have not noticed this in mine. I rode in the back seat to see if I could find where the sound was coming from, but couldn't seem to pinpoint it. I was just wondering if anyone else had experienced this or had a direction they could point me in to help correct it. Thanks in advance.