I'm getting a rattle around the passenger side rear at about 1750 RPM (Every gear but 5th). I've tried taking out the Shaker1000 subs and amps and it still causes the rattle. I've tried taping, zip tying, and even put cloth between the wires and exposed metal. The rattle is coming from the inside and can't be heard from the outside unless the window is open. Anyone ever experience this before and know how to fix? If not, any ideas what might be causing this?