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Message: <blockquote data-quote="hispls" data-source="post: 8851594" data-attributes="member: 614752">It is rather difficult to predict tuning on a flat wall so really you'll probably do best to have a plan on how you can alter tuning after it is together, sealed off, and can be tested.  Box can be tuned higher by shrinking the volume or tuned lower by adding more port depth.   If you don't have box volume to spare after the fact making the port wider can be done but it is going to be a shit job to have to cut.  DB drag vets I know up here aim for as much port area as they can get and as much volume and shrink the box to tune higher as needed.  Not sure what's practical in your vehicle, but I suggest you have a plan to be able to modify tuning later.</blockquote>

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