The one detail I will add is the pricing on the Stealth active wiring harness (OEM BMW) is much higher than what you can buy it for on the open market. In addition, they cut the factory plug off the end before shipping which in my opinion makes this more prone to damage from water.
I purchased the harness / controller separately from my BMW parts connection and bought the "right" parts to use the factory weatherproof connectors. I should add to the DIY thread with this info and will try to get to it this weekend.
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