The dealership wanted $95 to put one in, but he managed to add a 3.5mm audio-in port to his car stereo for just a couple of bucks. The connector on the back of his head unit is a 2×4 set of pins ...

The Dual XML8150, as the stereo head unit is called, is a mechless car audio receiver. ... At the base of the cradle is a 30-pin dock connector that interfaces with any iPhone or iPod ...