Ported box DESIGN HELP for a OLDSCHOOL15" Eclipse 88150TI

[Hybrid90accord 10+ year member]

ive been trying to find info on this sub i just acquired with no luck. Id like to build a ported box for it but im very limited with space. My maximum dimensions are 16.5" high X 18" Deep X 28" wide which should land me around 3.6 Cu Correct? I want to use a 4" PVC port with a tuning FREQ of 35hz would the port be any longer then 5 or 6"? any help would be appreciated, thanks in advance

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[Hybrid90accord 10+ year member]

im willing to pay for a box design if that helps getting a reply or some help period.