If you like listening to music with booming bass that you can literally feel, consider adding a subwoofer. These dedicated low-end drivers come in a variety of shapes and sizes, but they usually tend to be large and difficult to conceal. This arrangement allows for the unit to be covered with a grille keeping it out of sight and out of the way.
Installation requires removing one of the rear passenger seat belts and the rear interior panel.
This model is designed specifically to fit snugly behind the rear wheel well. Drill the holes and mount the speaker in position. With the subwoofer mounted, run the wire connections to the front of the vehicle. The wires will be partially concealed by the interior panel once it is reinstalled. The red power wire will need to run up through the engine compartment and connect to the battery so that it can power the subwoofer's onboard amp.