Shirley there is a page out there with the formula(s) you need to design/select this thing right. I found several pages with formulas for the length of a stack connected directly to the carb (primarily motorcycle use) but didn't dig very deep. See if you can find a page by someone who has already done the research and see what the optimum dimensions for the "bell flare" radius and the overall width are. The best "bell width"-to-throat ratio would be a big help.
From what little I've read while doing the above searches, best case is a 1-2% gain and that's starting with a "square" opening (radius of the flare is 0). If the boxes you are using already have some "contouring" your gains will be even less. But that's just what I read on the internet - all my experience with flow dynamics is related to flow measurement.
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