Typically, you can add a subwoofer to your factory stereo without any modifications. However, there are some situations where you may need to make a few tweaks to your stereo's installation. For instance, if your car has a special wiring system that prohibits the installation of additional speakers, or if your factory stereo doesn't have space for a subwoofer. In those cases, our experts may be able to help adapt the installation process to fit your specific needs.