Port area/tuning for 18" Death row

[Forrest Gump 10+ year member]

I'll be pushing this sub prety close to it's mechanical limits so there should be a good bit of excursion (not sure exact Xmax value)

What would be a good tuning frequency for this sub

How much port should I be using in an all out spl application

Thinkin of 2-8" aeros..Anyone had good results w/ more port than that?

18" IA DR

Mid sized suv

around 5.5 cubes

1800 watts

Not sure of any parameters

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[Forrest Gump 10+ year member]

ttt