I lost audio to my 2003 Boxster, and I took it in to the dealership.  They explained that I blew my amplifier.  They also stated that I would have to pay $800 for a new amplifer.  I do have the Bose Sound System installed, and from what I understand in order for me to put an aftermarket amp, I would have to put everything else as after market (replace bose speakers, cd deck, etc.)
The part # I need is 996.645.333.02.  Any ideas of what my next step should be?  I really do not want to spend $800 on a factory amp.