Hi Paul,
I have a question that I know you have asked as you own a RX8. The
auxillairy valve in the upper port in the outer housings! This is opp
orated by an electric motor and I would think controller ed by the
computer. My question is what rpm does it close and open. I have looked
at this unit and its setup and have come to the conclusion that it works
as a throttle for air mixture in cruise mod. This manifold is a work of
art but one needs to know what the computer is doing.
Regards Don

I have some more info on this I will upload later.

Paul Lamar