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It's in the technical manual not the operations manual. I found it online. But look at the picture of the accessories that is sold with the radio. You'll notice the yellow plug. That plug provides standard preamp output via two stereo pair RCA outputs.
IM seriously considering upgrading my stereo, especially the speakers. Was in my buddy´s 997.1 the other day and the stereo had nice bass and a clean sounding system. I really like the new porsche head unit with integrated bluetooth and nav. Anyone install one of these yet? Its supposedly made for 993 and previous models but I think it would look nice in the 996.