Yes, the plenum is the length of the chassis.
The regulator is up at the front of the frame, and the valve is opposite (rear of frame) everything in between is regulated air (plenum). Essentially a cylinder/tunnel probably about 3/4" in diameter and maybe 12-14" long? Just guessing on those dimensions so don't consider that hard facts.
For some reason 80ccs is coming to mind as the plenum size, but I'm not positive on that volume.
I just tried to find a solid number and AOA lists it as exactly one metric "massive" in their listing. Lol
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