These packages allow you to improve sound quality while retaining your factory radio (and, in many cases, your factory speakers). Vehicle-specific packages contain all the hardware and wiring you need for the installation.

Get the best possible sound from your iPod® and keep its battery charged. These iPod adapters connect your iPod directly to your vehicle's factory stereo, and most also allow you to control your iPod with the stereo.

These adapters convert the changer port on your factory radio to an auxiliary input, so you can add an iPod®, rear seat entertainment system, or other outboard audio sources to your factory sound system.

These factory system expansion controllers allow you to add sources to your factory radio, so you can build an audio/video system while keeping your factory look.

Integrate your compatible phone with your car's factory stereo system. These T-harnesses plug into your factory radio's harness, then provide a connection between your factory radio and a compatible Parrot Bluetooth cell phone kit.

Most factory radios use preset equalization curves to complement the factory speakers. These processors reshape the output of your factory radio for the best possible performance when you upgrade to aftermarket amplifiers and speakers.

A custom-fit subwoofer is designed to fit into a convenient spot in your specific vehicle, a great way to get great bass without losing any space. Some models include a built-in amplifier, while others require installation of an outboard amp.