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Message: <blockquote data-quote="SmokeyDog" data-source="post: 6350411" data-attributes="member: 614830"><p>not to thread steal'''''' but wpold an regular 4'' pvc port be the same as an aero port if i flare out the ends a lil bit?   got ruffly 9.05 cf after displace ment but with  port displacement . 38 hertz  i am thinking 6 4'' round ports. that would be 75ish sq inches of port area. all calculators say i should have 105 plus. but you say you only need 50% of what a sq or slot port needs. makeing what i need 40 or so real comfused</p></blockquote><p></p>

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