4th order bandpass help

[Bumpin_brothers]

I have 9 crossfire c3 12s in a Honda Pilot and I want to go walled with a 4th. I am very experienced in everything but bandpass boxes. I want to build something with good bandwidth 20-50 range but I want it to get really windy on the lows. I have designed a wall with based on what I know (8.25 cubic ft sealed and 20 cubic ft ported tuned to 43 Hz) but I want to have some sencond opinions before I go build it. Thank you!

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[Firewalker]

Contact @Buck he can design it for you as he has done stuff like that before.