Suggestion and volume for fiberglass box for VFL-8D4

[katit]

Hi!

I did search forum and found couple of posts on this 8in sub. At first I though I will build sealed enclosure and that would be the easiest knowing volume.
But all those posts pointed that it is best for this sub to be ported.

Because of space constraints - it will be custom fiberglass irregular shape and only 8in is really feasible.

Can I just create "port" from couple sections of PVC pipe just to get it to needed size?
Where is this port should be? Should it go outside to the cabin?

Image is to show current factory sub enclosure (plastic) and space..
Or maybe it's good idea to reuse factory enclosure and just fabricate whatever needed to mount new sub?

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