Vacuum lines on stock manifold.
 

There are two nipples coming out of the back of the stock intake manifold. One is slighlty above the other and is larger. The other is below and is closer to the passengerside of the vehicle. My question is, where do these vacuum lines terminate. Egr valve? Fuel pressure regulator? Can someone chime in and lend me a hand on this one?

Thanks,
DM