the item you circled in the 2nd pic is the ARV or air recirculation valve. i not 100% sure, but i think it opens up at some points while driving to put compressed air from turbo back into the air filter. it is useless, and i disabled mine via the BB in the vacuum line.
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Grey '91 350SDL 214k Dad's car
Beige '81 240D 4 Speed 254k SOLD
Blue '82 300D 225k SOLD
White '95 E300D 46k SOLD
Blue '87 190D 2.5 Turbo 315k SOLD
Brown '80 240D 4 Speed 716k SOLD
Beige '80 300D N/A 119k SOLD
Blue '85 300D Model 186k T-Boned
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