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Go to a a large hardware store and buy 2 band clamps that will fit around the heat shields and clamp them tight. This is the manufacturers approved fix for heat shield rattle. The fix sure beats the $1000.00 for a new catalytic converter assembly. I have done this fix dozens of times over the years of my car repair career.
Jack up and put jack stands for safety or drive up ramps. Start engine and find whats rattling. You can use the back side of a hammer and hold against exhaust shield to see if the rattle stops when you put it against it. If it is a shield you can get large dryer clamps and put them together and go around shield and tighten, that will stop rattle without replacing shield. Make sure you let exhaust cool before you try and clamp.
Jack up the car when exhaust is cold, grab any heat shields to see if they are loose. You can also tap them with something to see if they vibrate. It's very common for the heat shield to rust and a corner can break free, making the annoying rattle. I've fixed this with a coat hanger cut to secure the loose shield, or a screw installed to hold it tight.
Had my y-pipe replaced (bad cats) and the bolts at the y-pipe flange where it attaches to the exhaust manifolds started to get loose and I go tthe viberating (tinning) noise. Took it in the first time and they tightened everything up but it seems it's doing it again so I'm going to try to fix on my own. Just wondering how much of a pain it's going to be to get to the bolts and what size...
It almost sounds like you have a heat shield that is loose on your exhaust system. Let it cool, and try to reach under, lightly bumping the exhaust pipes with your hand. If you hear any rattle noises, or squeeks then you have a loose shield. you can ither remove the shield, or try to use a large clamp to go around it and tighten it up.