I actually had a conversation with them via email a few weeks ago about the stack system. The stack system is currently being re-designed and should incorporate some type of air filter. He said the car would need to be brought to them for a full tune with baseline dyno's etc. I think they have it on the website to show that they have the capability to provide such a system but, its not a product ready to go in a box with software at this point in time (may never be?). Its done on a case by case basis which is why you don't see a price on it.
they said they'd contact me when the new system was closer to being complete.
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