Just picked my car up from the dealership and it appears to be fixed for now. Although, I have not driven it very much yet.
I kept getting what sounded like an exhaust rattle as the RPMs fell through the 2200-1800 range.
I took it to one dealer about 2 months ago and they adjusted the heat shield. It did the same thing when I picked it up.
It went to another dealer this time. The tech notes say that the rattle was internal on the cat converter. They replaced the converter, bracket, and bolts.
All seems well now.
I kept getting what sounded like an exhaust rattle as the RPMs fell through the 2200-1800 range.
I took it to one dealer about 2 months ago and they adjusted the heat shield. It did the same thing when I picked it up.

It went to another dealer this time. The tech notes say that the rattle was internal on the cat converter. They replaced the converter, bracket, and bolts.
All seems well now.
