I have two 12's in a 5.50^ft box in my car right now actually, and it's not really that big. I just want the sub to be below the seat level. It could be bigger but I don't really want it to be .But yeah I am serious. I got ripped on a trade and some money, so I'm cutting my losses, throwing a little more change in it and just getting a beefier, bulkier sub that I know will get loud.