'03 A6 - where's the n80 valve?
 

Dealership indicated my n80 valve needed replacing. Quoted me $320. Saw the part is $18 so I bought it myself (Bosch OEM part) and now trying to find where it is in my car. Any help would be appreciated. Is what I show below the right spot? My replacement part (pic shown below) doesn't look like what's currently there. Last pic is the part I bought

Are you certain you bought the correct part? I've looked through some of the purge valves sellers offer for your car/mode/engine and it looks like the one you found in your engine bay. The purge valve you bought however appears to be for an a6 with a different engine, since I can see that little holder that is supposed to slide into a plastic piece to hold it in place.
Double check that part number with the one you should have bought = 1C0906517A

Thanks Sheldon. I do believe I've got the wrong part. Going to the dealership tomorrow to get the one you indicated.