It is basically an elongated 846B for either sealed, MLTL loading with slot vent near the bottom or dual 15" with stock pipe vents with location determined by desired performance, so has an encased horn section per these guidelines with a ~ 11 ft^3 empty volume [Vb] and ~8.62 ft^3 if the horn section is sealed up/omitted, so your call: http://www.lansingheritage.org/image...ign/page22.jpg
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