Mazda rx8 squeak - any ideas?

[codyAK]

http://www.youtube.com/watch?v=li2vdGewp7w

Hopefully the video link works.
When only one person is in the car, almost no squeak. Add someone to the passenger seat and there's a little bit of squeaking. Put someone in the backseat and it's crazy.. Video is with three people in the car.
It can't be recreated by pushing up and down on the back of the car or at either corner.
When you take turns or curves left it's silent, and when you take turns or curves right it's pretty bad.
Car is a 2004 Mazda rx-8 shinka edition, six speed.
Any ideas?

 

[Fivefingerdeathpunch]

link does not work

 

[codyAK]

Grr I was wondering if it would.. One sec.

 

[codyAK]

Ok should work now.

 

[matt5112]

have you tried turning your head side to side to attempt to locate where its coming from?

 

[codyAK]

Yeah best I can hear it sounds like it's coming from passenger rear area.

 

[blueguy]

Check under the car for wearing marks. My bet 20 to 1 is that something is either loose or he has exhaust rubbing somewhere. I had a horrid screech after I bought my car...turned out the o2 sensor was rubbing the exhaust shield. I got the U-Bend deleted and it fixed that...maybe try there.