FG ported box help

[LightningStryk7 10+ year member]

Alright, I want to build a new ported sub box for my Type R out of Fiberglass. I see alot of ported FG boxes, and im just lookin for some pointers on how you guys roughly got the correct volume and port length. Im guessing you just estimate alot?

thanks.

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[bjfish11 5,000+ posts]

2 things I use a lot.....

Packing peanuts and precision ports.