yes hooking the 3rd vent port to the intake pipe is a good idea for emissions, however is totally irrelevant in this discussion, 1 port goes from the compressor housing, 2nd port goes to w/g actuator, 3 port vented to atmosphere or plumbed back into intake

where is a 't' piece or restrictor required in this setup

why would asg set it up like this? my grimmspeed wasn't when they tuned mine