Noob question

[R32rb25det]

Ive had my car now for 4 yrs and I still dont fully understand the turbo system.
So my question is I just got the new intercooler piping and it has the hole for the blow valve and another hole near the top. The cars not running right so Im wondering should I just close that breather hole or is there a reason for it. It looks like this :

[gtst_type_m]

an actual picture of it may help there shouldnt be any holes in the chrage piping unless its for the intake to the turbo and that would be for the pcv hose

[danwit]

Hard to tell by whats drawn there but its probobly a nipple to connect a vacuum line for a boost guage/controller. If you have neither just plug the hole.

[R32rb25det]

Yea, ill take a pick tomorrow

[R32rb25det]

[Skym]

Looks like where the vacuum hose for AACV, IACV goes.

Stock J pipe has the same fitting but after BOV (on RB20DET) and I gather before BOV on RB25DET -

[R32rb25det]

I'm just going to seal it off cause the AACV IACV is already connected to something else