Hello everyone. So I just recently did my head gasket on my GSR turbo hatch. Nothing to crazy and I was wondering. I took this hose out after I was finished but before it was on does anyone know what it's for or what it controls? The one that is circled was connected before I did it. Now I have that, with no hose. Does it matter? Need help.

 

That port opens and closes the secondary butterflies in the stock GSR intake manifold. If connected to a vacuum source, it will keep the short runners closed while cruising and open them under WOT. If you are still using the P72 ECU, the vacuum canister and solenoid control open the runners at a specific engine RPM.
Most importantly, since you haven't changed the intake manifold, you may have a vacuum leak by not connecting the line that you have likely left unconnected where it should be connected at the IAB control device that you have circled in the photo above.

 

currently I have it on a chrome chip , but I will be tuning on Hondata S300 V3 Friday.