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Message: <blockquote data-quote="bjfish11" data-source="post: 4215548" data-attributes="member: 562873">And actually, it depends on how you calculate it for sure. In a sense, both of us were correct.I found the installation instructions included with a 4" port. It has the formula for lv. Once calculated, it says subtract 5". Then when its assembled, a flared port will be 1" longer than lv. Well on the psp-inc site, it has length for both straight and flared ports. If you use the flared port length, you need to subtract 6" off the length and cut the tube at that (because it has already added the extra 1" onto the lv). But if you use the straight port length, subtact 5" so that you can gain the extra 1" on overall port length.</blockquote>

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