Elbow install help

[Mesarina]

Hi, I just bought a 70mm elbow for my '94 180sx , which came with the o2 bung, and gaskets; My stock elbow came with another bung near the 3 bolt flange that connects to the downpipe, that has a pipe attached to it, that goes to a box, and that box connects where the air filter intake goes; what that for? can I eliminate all that?
http://i283.photobucket.com/albums/kk287/armadajspec/NEWARMADAPICKS102.jpg

[AEGIS]

thats all smog related stuff i believe... just plug em up and go.

[way2fastforu]

its jus for emissions plug it up it'll be fine i removed it from my ps13