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Success! The new style 2019 M2C carbon fiber exhaust tips with clamps fixes the cold start rattle. The part # is 18302456072.
I couldn't be happier with how my dealer handled this. They went above and beyond, acknowledging from the beginning the noise wasn't acceptable. They replaced the whole exhaust system, then tried more of the old style tips, and eventually agreed to upgrade me to the new M2C version tips, which solved the 20-30 second cold start noise.
Here are some pics of the new style tips as requested. You cannot see the clamps unless you get down really low.
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