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Starting with 2003, they went to the MOST system which is a fiber optic bus for all the audio components like amp and CD changer. I am not aware of any aftermarket head units that support MOST, there may be some out there, I just am not aware of them.
If you just have the basic system (with or without rear speakers), no amp or CD changer, you can use any aftermarket head and amp. If you have the upgraded system with an amp and/or CD changer, you will need to replace the amp and changer if you change the head unit.
In addition, the BOSE system uses special very low impedance speakers. You can use the speakers with a different amp.
In my 996 Targa, it has the BOSE system with an Alpine head unit and amp. The CD changer is not connected. Works and sounds great
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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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2004 Porsche Boxster S
2004 Porsche 996 Targa
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