Keith,
Here is what I was able to find: the CDR-23 makes a great replacement or upgrade for your Porsche. These are a plug and play application for most Porsches manufactured 2003 - 2005. With some modification, you can install these in earlier models. The CDR-23 has CD changer controls.
I would not know what modifications you would have to make, you may want to post in the forums and see what you find. Hope that helps.
Bob
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