I have a 2003 Boxster with the CDR 23 radio and it is a MOST car. It came with only the speakers in the dashboard. I bought the Porsche rear speaker kit a long time ago and installed it following this Pelican Parts Technical Article. The kit came with 2 different plugs- 1 for cars that had an amp and door speakers and 1 for cars that didn't have them. I believe the fiber optic MOST bus is just between the radio and the amp, my speakers all just have regular wire because I have no amp. I don't know if the rear speaker kit is available any longer but maybe the information in the article can help you figure out what you can do.
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Current: 2022 718 Cayman GT4, PDK bone stock (the dark side).
Former: 2003 S, 3.6 LN Nickies, ARP rod bolts, under-drive pulley, Fabspeed sport headers, Softronic tune, 987 airbox 987 motor mount, Function-First Sport motor mount insert, Ben's short shifter, Nine8Six projector headlights & center caps, ROW M030, stainless flexible brake lines, B-K rollbar extension & fire extinguisher mount, hardtop
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