I'm sorry that I can't tell you how to do this, but I can share some information I've seen over the years.
If you have a CDR 23, you face a significant challenge installing it in a 99 Boxster. Assuming the Australian and U.S. audio systems are similar, the CDR 23 is a MOST (fiber optic based) system and your 99 Boxster isn't. You would have to find a MOST amp and cables if you want this to work.
I think most people that have contemplated this project discover that there are better, less expensive and less labor intensive options available.
If you have a CDR 220, I think it can be done but you need to have the DSP amplifier and the cable that connects the head unit to the amp.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 12-way driver & 8-way passenger seats, Litronics, silver console
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