I'm not sure if I have the same noise, but I do have an odd high pitched metal rattling noise coming somewhere between the headers and in front of the rear doors, so it's probably the cat. It annoys the hell out of me too, and I'm hoping it won't be a problem to fix.
2003 Sunset Metalic Orange H2 - Breathless Stage 2B, HID's, Gobi Rack & Ladder.
2003 Millenium Yellow Z06
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2004 Black Silverado SS
2003 Millenium Yellow Z06
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