no space...what pr's to use?

[leonsv 10+ year member]

so i'm getting 2 8" rli's .5 cu ft for each. and heres the problem...i really want to do ported but there simply is not enough space (box under rear bench of a truck). so i'm thinking of using a passive radiator instead, which one should i use for a 8" rli with 18.3 xmax?

thanx

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