Thanks Dukk, it seemed screwy to me that something with less air capacity could perform just as well.

I've been thinkg about doing a square port - easier to build around corner. How do I acount for the bend in square port? Do I measure the two inside lengths, or the two outside lenghts, or the inside of one and the outside of another ( I think this is what I need because that would get the overall volume of the port.

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