Direct connect works by integrating your iPod directly into your car sound system. With this method, you are tricking your stereo into thinking your iPod is the CD changer.

The cool thing about this is that your standard stereo and /or steering wheel controls will manage the iPod. It will also keep your iPod fully charged and ready when you leave the car.

Play List Adapters
These play 6 to 12 different play lists, depending on your car, by representing CDs in the CD changer. Don't panic, each play list can have an unlimited number of tracks. This connection method, however, puts your iPod in a docked state, which disables the iPod buttons and displays a docked message on the LCD. But your stereo controls are fully functional and the iPod can be tucked safely out of sight. The disadvantage is that for the most part you'll have to navigate your play lists blindly if your playlist adapter doesn't send the CD-text to the stereo.

Direct Control Adapters
Direct control adapters allow greater flexibility because they don't disable the iPod controls and display. This allows you to select any playlists and songs using your iPod interface and use your radio and steering wheel to change songs, adjust volume, etc.

iPod Adapters for Aftermarket Radios
These offer the greatest level of control and integration compared to factory-installed stereos and you'll get CD-quality audio. Some aftermarket adapters allow complete control of your iPod while some place it in a docked state, but you can use the stereo to navigate the songs by artist, album, and playlists. The more expensive the solution, the easier the song navigation.