Not sure if this1 is useful or not, for an idea I had earlier today, a car computer based on free or nearly free technology...
That looks a bit basic but assuming I can plug usb fm transmitter2 into a raspberry pi then my car computer can handle all the sound needs without any rewiring, just broadcast over fm just like the itrip type device I have right now for the ipod. It might not be the best quality but I can give it a go without rewiring the car.
raspberry pi: Credit card sized super cheap computer, awesome.
Paul Clarke's blog - I live in Hythe in the deep South. Married + dad to two, I'm a full stack web developr, + I do js / Node, some ruby, python, php ect ect. I like pubbing, running, eating, home-automation and other diy stuff, history, genealogy, Television, squirrels, pirates, lego, and TIME TRAVEL.