I think boas are a little more resilient than ball pythons when it comes to space.
I got my boa from Jimi, and I had asked him what size I should move her up to. She was in a 6qt with him, I had her in 12qts for a while. She was just so active and never missed a meal, always healthy. So I put her in a 4x2x2 cage once I got them, and never looked back. I did monitor her eating, moods, and weight for several weeks. She is still the same boa, just with more room to roam, which believe me she uses.
Boas are really curious about everything and I think mine appreciates (as much as a snake can) the extra roaming room.
EDIT: I would like to add that she has many plants, and hides in her cage in various different places with different temps so she never has to chose between security and a comfortable temperature for her. Although she really doesn't use the hides, she loves the vine, and burrowing in the aspen.








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