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Brought mine in today for this high pitch rattling/flickering sound. Of course, as I'm riding over there, I have the sound - at a pretty loud volume. Once I get there and take the service guy for a test drive, it almost completely disappears on me. Luckily, I was able to point it out and he could hear it - though it was about one fifth the volume it normally is. The service guys were thinking the noise might be dampened by the humidity (it was raining).
After waiting for a few minutes while they look at my car, I was told that my car has an old muffler that is no longer installed on newer Camaros. He told me they would order a new muffler and install for me when it arrives in a few weeks. I haven't heard of Chevy changing the muffler they used, but if it's the problem and it can be fixed, then I'll be happy.
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