87ghosts

I really need your help with a box design. Ive built some sealed and some ported boxes and have had good luck with them so far. I don't have the money to build multiple boxes to learn to build a 4th order box. I just acquired a 1999 lexus es300 and I need a box like this for two alpine type r 12's. I know it takes a lot of time and effort to do the math. I would greatly appreciate any help you can give me.