I had a rattling noise coming from my Z a few months back. It would not do it cold but got progressively worse while it heat up. I got under the car and with a mechanic’s stethoscope found the sound coming from my passenger side cat. It struck me odd since the car had ~39~40k miles at the time, but I took it into the dealership and they replaced it under warranty. You have 8 years warranty on the cats.
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