Aero port question

[berretta96 10+ year member]

Because of the odd and limited space under the seat in my truck, I'm considering building a box around 1.0 cb ft and extending a pvc port along the length of the seat. My first question is what differences are there between a longer bigger diameter vs a shorter smaller diameter? My second question is, has anyone built an enclosure with an aeroport extending 20+" externally and will it need some kind of bracing (i.e. fiberglassed)

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[BOOMINGRANDPA 5,000+ posts]

bigger may normally be better but as long as it's not to small it's fine, i didn't see sub or port size 12" needs at least 3" each (4 better) if possible but the sell dual 12 boxes with 1- 4" port, so under seat u gotta do what ya gotta do i guess., port sticking out is fine..