When upgrading any car or truck's sound system, a subwoofer is always a must. The only negative of adding a subwoofer is locating the sub box. You only have so much free space in model vehicles and no one wants to waste that space. This is the reason for the popularity of custom-fit subwoofer enclosures.
Most custom-fit sub boxes are made to fit either under a seat, behind a truck seat or against a side wall in a SUV, hatchback or car trunk. In any case they make good use of that "wasted space" that exists in almost all vehicles. The additional benefit of the custom-fit sub boxes is that they allow an easier install of your amplifiers since they leave more free space then when installing a large standard sub box.
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