If you want to play music from your portable payer, but keep the factory stereo, options have been limited. The CD Connect device (~$160) from SaabAUX is a great solution for older Saab models. CdConnect is a retrofit aux kit for Saab 9-5 and Saab 9-3. Easy to use and works with all music players that have a standard 3.5 mm jack.
Only downside is it doesn’t charge your player, and you don’t have steering wheel control of track selection. But, unlike the FM modulators and the tape input methods, you get the full 20Hz to 20kHz frequency range, just like the CD player.
It works really well so far, and was quite easy to install. It’s all plug and play. See the following two different video how to install the device: