Exhaust Leak Sound Fooled Me for a Year – What Was the Real Problem?

Tracking down and fixing a very uncommon problem on my E46 BMW.

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*Disclaimer*
Due to the litigious world we live in, I have to include this statement:
I cannot guarantee against improper use or unauthorized modifications of this information. The creator of this content assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. I recommend safe practices when working on vehicles and or with tools seen or implied in this video. No information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not the creator of this content.