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My take is the stage 2 adds a solenoid and inside switch to block the flow of freon from circulating through the cabin. Nothing across the evaporator, everything is going solely through the chiller. I would guess same chiller and no extra HX
The comp solenoid allows you to run the AC system in 2 modes:
1. Cabin and Chiller
2. Chiller only (race track safe)
In chiller only mode you are able to get colder intake temps and you will pass tech inspection at your race track as condensation is then unable to form on the cabin evaporator and you are then allowed to use the AC system on the track, as long as your intercooler lines are also insulated to not drip condensation.
The solenoid is controlled by a simple ON/OFF switch inside the cabin.
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