It should look like the picture below. You need it as it is the equivalent of an air flow meter (which the c16xe had but they changed it on the x14/x16).
http://thumbs2.ebaystatic.com/d/l225...yegzQBjrcw.jpg
[EDIT] The wiring will probably be around the same area as the EGR valve as it would have connected near the throttle body into the black plastic inlet manifold/filter pipe.