Well, there are different ways. If you want the same comfort functionality as your MOST bus hifi system has, you'll need a CAN bus adapter to generate the ignition, speed, reverse signal.
That means automatic turn off if you remove the hey from the ignition switch, turn radio on/off while there is no key in ignition switch, correct speed signal for navigation system, correct signal if you put your car into reverse…
Don't have the time to research, but this seems to be the right module if you don't use the stock fibre optic amp system (MOST bus):
http://www.caraudiodirect.co.uk/connects-2-ct53-po01-porsche-boxster-911-active-system-adapter-non-fibre-optic
If you're using the stock MOST bus amp, you'll need something different. Ask the dealer before buying, if you are interested in the more sophisticated version.
Regards, Markus
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