I need the best SPL only box for memphis mojo 12

[GHXTREMESPL 10+ year member]

I have 6 memphis mojo 12 and 3 memphis 4000 watt amps.

The box I have now is 15 cubic foot with 2 speakers in each enclosure.

So each pair of 2 are in 5 cubic foot. My ports for each box are 12.5x5.5x12

With this box we did a 154.0 with it.

Memphis tech told me to put them in 8.5 per 2 with the ports being

12.5x12.5x12.5

Any ideas to get to the 160 mark?

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[loudaccent 10+ year member]

wut kinda vehicel

 

[GHXTREMESPL 10+ year member]

2001 Chevy Blazer