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Cdr23
I have a CDR23 in my 2003 Boxster and it is my understanding that Porsche went to fiber optics in 2003. Apparently it is very difficult to find equipment that is compatible with the fiber optics. I have a the hifi option so I have an amp, speakers in the doors, and I put rear speakers in that I bought from a dealer. If you have a 2003 or newer be sure you talk to someone that knows the system before you buy equipment.
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