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The noise could be due to worn universal joint on drive shaft. Could be going bad. Slowly starts as a rattle with a little vibration and over time it gets worse. If there's no propeller type drive shaft, running down the center under the car, then it is something else
I had rattling noises as well (over bumps and when I reved the engine) and it turned out to be the heat shields under the car. I took out 2 heat shields covering the two cats on both sides AND two rusted out dangling rings hanging from the exhaust coupler (have NO clue what they were for)..This has TOTALLY gotten rid of the rattling noise. Good luck!
I had the same problem! I crawled underneath the car and discovered that a heat shield on the exhaust header pipe was corroded and rattling against the exhaust pipe. (Before the muffler) I removed the portion and clamps and solved the problem. Give it a try.