Hi,
I've just completed a project on the head unit of my 9-3 to provide an auxiliary audio input for my iPod. This is a variation on a couple of themes from this forum - you basically replace the audio signals from the head unit's CD player (I haven't seen instructions for this, hence my post).
You don't need to cut any wires or tracks, and the mod is completely reversible, though the soldering needs a steady hand ! In it's current form you insert any old CD in the player to get it going, but the iPod/MP3 player gets routed to the amplifier, not the CD (who cares if you can't play a CD - you've got them all on your iPod !). I have an idea for a dual-purpose mod, which doesn't need a switch, but haven't tried it yet.
Is anyone interested ? If so I can post instructions and pictures on a blog somewhere.
Cheers,