I’m almost done on my exhaust. I need to add one O2 bung to my down pipe my AME. I ordered some 2.5” exhaust tips for muffler. I plan to have shop next to make a Hartge tip. It will be be made of thin stainless sheet metal. I do have Hartge e30 m3 exhaust systems. I don’t think they can breath.
This what it should look like.

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