Sub box...

What is the best type of sub box to get if your putting 2 12s in the trunk of a 99 civic?

What do you want out of your subs?

A sealed box is going to sound cleaner than any ordinary ported box. A ported box will be louder and boomier but won't sound as good unless the box is tuned correctly.

What is the best type of sub box to get if your putting 2 12s in the trunk of a 99 civic?

I want them boomie as possible without losing much of the clean sound.
Right now I have a Ported box, right and left area, 3 ports for each area on front of box then plexieglass over front hole.

Your bandpass box is not what you want then. Bandpass boxes are like audio rice lol. All form and pretty much no function.

Get a custom ported box made to spec and have it tuned. That'll get you what you want.