I hear a metallic rattle from my rear deck everytime I go over a bump or drive over a rough patch of road. I had someone sit in the back and it's coming from the rear passenger side between the speaker and the side panel of the car.

I brought it to the dealership, but they said that it might be related to my Tein Basics and that they wouldn't fix it. I searched and found a G35 Sedan forum that pinpointed the rattle to a trunk wire, but I'm not sure if that's the source as the wire is located more towards the center of the car.

Any suggestions? The rattle is annoying the crap out of me!