the stages are
1st stage: all butterflies are closed and the air takes the TEDIOUSLY long route around the back edge of the manifold then around, then back up fron to the runners. thorugh 1500rpm i think, this long tedious tract is optimal for most lowend torque.
2nd stage: the outer flaps open and air flows freely upwards to longer of the runners...
3rd stage THE MOVIE(

inside joke): the middle flap opens to expose a direct run to the intake runners and act as a single plenum instead of a bunch of runners.
sorry i dont know if anyone answered this yet but i saw Dv8 wondering something....that doesn't happen often
i dont have my book with me here, i wish i could scan it...it has the diagram of the stages.
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