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Aftermarket junk.

With factory wires, the Germans are pretty good about using brown wires for ground.

I agree that it is probably for an aftermarket or non OEM item, for factory wiring they used a vinyl sheathing, and not the newer corrugated wiring shield.

You would need to see what is working to determine what isn't, it could be that the item was removed and buried, and in removing your air box, you
re-discovered it.
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