Blowthrough design

[basshead08 0]

I am getting ready to do a blowthrough in my truck. The subs I am planning on using are 4 Audioque hdc3 18's. The dimensions are 50x17.5x77 inches. I will be running them off of two IA 40.1's strapped. I have built several boxes but never a blowthrough. I have heard that bandpass is the best way to go when doing a blowthrough...is this true? Anyway is there anyone who can design me an enclosure for this setup? I will pay of course just let me know.

[basshead08 0]

bump...No opinions? Any and all help will be much appreciated.