Mate, as I said before, it's the variable inlet manifold change-over valve actuator. A8 parts had them but a repair kit from Audi was, I'm sure, about £160!!
It is very common and that's what I put in Audi Driver.
It will be dramatically reducing power at lower revs and responce from pull away.
Dead easy to swap tho, just one pipe to it and one securing nut (next to vac pipe feed in). You can't buy just the connecting bar from Audi unfortunately.
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