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<blockquote data-quote="Immacomputer" data-source="post: 3997773" data-attributes="member: 570419">You should experiment with various lengths of PVC pipes. Even though it will be difficult to impossible to calculate the tuning frequency, you could always experiment by ear to see what you think sounds best. I doubt it will work well but there is a pressure build up in the trunk which will excite the air mass in the port.I would start with like 2 or 3 4&quot; PVC pipes and start them with a length that is close to the max height you have available while keeping the ports about 6&quot; from the bottom of the trunk. Then, you can trim them down and see how the sound changes.Be careful though, as making small changes may make the differences harder to tell. You may want to have two sets and make one set your max length and make the other only about 4&quot; deep each or so. Replace them back to back and see if you can tell a difference. It will only cost you around $10 at Lowes for the PCV pipping.</blockquote>

[QUOTE="Immacomputer, post: 3997773, member: 570419"] You should experiment with various lengths of PVC pipes. Even though it will be difficult to impossible to calculate the tuning frequency, you could always experiment by ear to see what you think sounds best. I doubt it will work well but there is a pressure build up in the trunk which will excite the air mass in the port. I would start with like 2 or 3 4" PVC pipes and start them with a length that is close to the max height you have available while keeping the ports about 6" from the bottom of the trunk. Then, you can trim them down and see how the sound changes. Be careful though, as making small changes may make the differences harder to tell. You may want to have two sets and make one set your max length and make the other only about 4" deep each or so. Replace them back to back and see if you can tell a difference. It will only cost you around $10 at Lowes for the PCV pipping. [/QUOTE]

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