Mk1 1.9tdi

[Galaxy newbie]

Hi guys don't know if you've been reading my other post about fitting another engine to my galaxy. Well it's in and running thanks to members on this forum. Thank you very much. But I have 2 inlets/outlets on my airbox that have no pipes going to them. As you look at the engine from the front and look at the airbox there's 2 in/outlets that come out from the side of the airbox closest to the engine down low on bottom half of box. Could anyone do me a big favor and tell me what connects to them and where they go please. I have all other connections done. Ie Maf, pipe that runs to the top back end of box. Thanks in advance. Andy