20b throttle body vac line
 

Hey people.
I'm now using the 20b TB instead of dbw on the 20b rx8.
I've removed the outer butterfly and the water lines. Just left on the TPS and idle speed sol.

I have one vac nipple at bottom, can I just connect this to plenum, do u know?
Was thinking it was some kinda vac balance for idle sol.

Thanks in advance.