i believe its the vsv, that has to do with emissions. my vac line is blocked off. then again so if my egr. If you dont care about emissions and you arent noticing a difference in performance than id say cap off the vac line and let it be.
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-868 Miles on new jasper engine
-All hard pipes
-0.57 trim ct-26
-greddy type S
-greddy profec b
-apexi ride high 7 way adjustables
-eibach springs
-slotted rotors
-mkIV TT rims (front)245/45/17 (rear)285/40/17
-targa 
-greddy turbo timer
-egr eliminated
-3" turbo back, no cat, no resonator, Apexi N1 back.
-n/a cams
Theres others ill think of later.
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