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Hmmm - good question. It does appear to be related to the emissions control systems, looks like a vaccum vent (not signal) line. Hard to tell though. My cars don't have any vacuum plumbing on that side of the car, and I've never worked on a 2.5 Turbo. I'd poke around some more and see if you can find what it was supposed to connect to...?
Good luck,
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