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The third independent Benz shop I brought it to finally was the one that rolled their eyes at a $5k catalyst and said he can make aftermarket ones work, or a trade-in core to ********. Also, as a side note, he thinks it actually might just be a rattling heat shield. But we'll see. He's going to plug it into their diagnostic computer and pull any codes for review.
Thanks for the advice folks.
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Adam,
2019 BMW 540i
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