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You'll never get 4 12"s into the trunk of an Alero, the trunk at best is 13 cubes, its best to at most only use half of the air space in a trunk of best SPL. Unless you have the box going into the cabin of the car it's not going to happen. By the way that box is only 2.48 TOTAL, thats only 1.2 for each sub. The box in my car takes up 8 cubes so I had to seal it off from the trunk, with somewhere around 2000rms I'm doing 143.1 db, thats loud. I could build you a good box for 2 12"s ported for 100$ to 120$ plus shipping that will be better then any prefab box, just depends on how strong you want the box. What state do you live in?
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