I've got an R33 S1 and a S2 turbo here, neither has a nipple on it however, the R32 turbo I just sold did.
The stock top intercooler pipe has a nipple which goes to a T piece, a hose comes off the T and goes to the wastegate actuator, another hose goes from the T to the stock boost solenoid, with another hose going from the solenoid to the Bov plumbback pipe.
Looks like cooz you don't have the stock cooler pipe with the nipple, the boost T is coming off the charcoal canister hose.
This seems kinda weird to me.