Bryce

Center of the pic. The green thing. It looks like it was for the old non EFI engines? For heating the air or something? It goes nowhere.
<img src="http://pictureposter.audiworld.com/1414/extrapart.jpg">
and finally a pic of my new addition...that isn't running right now.
<img src="http://pictureposter.audiworld.com/1414/my4000s.jpg">

Evilclown

There's normally a hose that runs from that to the airbox to help heat the intake air when the engine is cold, then a flap shuts as it warms up; the purpose is to help the engine get to operating temp faster. It was used on carburated and EFI cars, so it's supposed to be there, but it's not hurting anything by not being hooked up.

porterdog

Right. It's not exhaust that flows out, just air that's been in contact with the outside of the ex man. Why exactly are you supposed to remove it?

Robert

Bryce

even though he knows it has no functional purpose, and it won't hurt to leave it. he just said, that a hard assed smog tech would make me remove it before the test.

Dwight V.

He's an idiot. It does nothing if not hooked up, and has no emissions function.

porterdog

Cripes, that's incomprehensible. Does nothing but it's gotta go?!

Evilclown

I've yet to see a VW or Audi with a CIS variant that didn't have that on it. Almost none of them are hooked up, but it was there when it left the factory. It's just a piece of tin that takes the ambient heat from the exhaust manifold and pipes it to the intake. Emissions aren't affected at all.