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If the car has every bottomed out before, you may also have dents in the Y section of the exhaust system.
Thats waht happened to me, and my insulation had deteriorated to nothing.
I tried banging the y shielding, and moving the insulation near metal contact points, but rattling came back after a week.
If it is the Y-shields that ardub described, just go to Home Depot, buy some rustproof, steel strips of metal and clamp it between pipe and heatshield.
I effected that fix last summer, and its been golden since.
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