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Message: <blockquote data-quote="Trixter" data-source="post: 1988852" data-attributes="member: 542668">use the internal volume with the sub displacement. figure out port length using that number. now that you have the length, you can find out the port displacement. subtract this number from the net volume + sub dispalcement and refigure the port length.i'm not sure if your using an online port calculator of pencil and paper. if your using a calculator, you may wnat to find out if refiguring is necessary. some calculators account for port displacement on the first try. (use the old skool method myself.)</blockquote>

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