Twice this year, I had to reattach the heat shields (catalytic) and the rear (next to muffler). Just this weekend, after driving 150 miles, the metallic rattle suddenly appeared (at highway speed). I found that the two bolts that held the heat shield had finally corroded the heat shield completely producing bigger holes than the washers. Relatively easy fix! I reattached them using oil drain washers--they perfectly fit. The other heat shield around the catalytic converter was fixed earlier this year by using two 6 inches steel ties. No more annoying rattles!
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