2003/4 models use the MOST bus. If it did not have a factory amp or CD changer, it wont have the fiber optic cable (MOST). Also the CDR-23 uses the MOST bus as well and probably wont work with an older factory amp or CD changer. If you have an older radio, it probably would work
You could go with an aftermarket amp. Not sure if there are aftermarket CD changers that would work with an CDR-23 (don't think so)
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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