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Tom,
Honestly, before going under your car and removing heat shields, I'd take a garden hose and try to power wash the underside of your car to remove as much rocks and debris that's caught in the heat shields... You'll be surprised at how much you'll find.
If the rattling persists then you might want to look into removing your resonator (if you haven't done so already - can't remember).
Another possibilty is seeing whether any heat shields that 'clad' the exhaust system from the headers back to the y-pipe are lose.
My $0.02...
-Chike
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2013 Cosmic Blue 5spd Evo X GSR
2006 Galaxy Gray 6MT RX-8 (sold)
2006 Steel Gray WRX TR (sold)
1996 Brilliant Red SVX L (sold)
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