I am about to swap GSLSE intakes 'cause I have cleaned up a spare and want to make the engine bay all shiny like. However I just noticed for the engine in the car; there are only three hoses that can be connected to the passenger front side of the plenum while any other GSLSE plenum I've worked with (including the shiny one) accepts four hoses. It is the top most hose that cannot be found on the plenum in the car. The famed colour coded hose diagram on the RX7 Club site denotes this as a manifold vacuum hose.

Anyone know the story behind the missing hose?

 

Nevermind. Took it apart. Hack job from before I owned the car. All GSLSE plenums have four hose connections in this position.