If you are talking about the 2 lines above the throttle
linkage the small one is very important,dont run the car
without it.
Follow the big one to the other end and tell me
where it ends up at.
If you are talking about the 2 at the turbo inlet
thats a different story.It been awhile since I
have messed with a stock 2.3T but I want to say
the solenoid the vacuum line goes to limits boost
to 15-18 lbs in first gear. We have never used one on
a 2.3T car and its one of the first things to go.
The hard plastic line runs up the frame rail
and is about 5/16 id?It went to the vapor cannister
at one time.