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Probably for coolant - should have some heater hose attached. Is there similar thingo on the other side?Can anyone please tell me what this hole/pipe/vent is for and what should be attached and where should whatever attached attach to? Thanks
That’s just a vent needs to be open to the atmosphere. Usually it’s plumbed into the Airbox or intake pipe.
When using boost depending on converter model you can boost reference it so that positive pressure forces the diaphragm to move further to supply more gas when required.