Wow crystalworks! When it comes to electrical work, I'd rather do a M54 starter swap!

A chart like that makes it so simple. A single male/female connector with enough pins makes an upgrade easier. Especially to add a big woofer amp. I'll start looking for a connector.

Thanks for all the input! I'll have to put this project off for a bit. I have two HKA codes to deal with. Plus a hitch install to complete. I'll add to this post when I come back around to this project. I'll make notes to add to my X5 notebook.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)