SR20DET vacuum line set up for dual port BOV

[S13queen]

My question refers to the Vacuum lines on a SR20 for a dual port BOV. I know that the FPR is "T'd" to a boost gauge and then goes to the 2nd port on the right of the intake. The first goes to the BOV and the third underneath goes to a "T" for my EBC then to the wastegate.. My problem is my BOV has two ports the one on the top goes to the 1st intake port however where does the other port go to? Any help would be greatly appreciated! Thanks!