I had been repeatedly told by a number of local audio shops that the factory Bose system on my 2009 Cayenne S could not be upgraded without re-wiring all the speakers because of the fiber optics. That expense was a non-starter. Crutchfield claims to have an adapter that works with the Bose system (made by Scosche) so I ordered their install kit and Pioneer radio. Sadly the adapter was no match for the fiber optic cables or the car's harness. I had to return it and received a full refund. More internet sleuthing led to Spiral Audio in FL. They have an adapter kit IX-PR003 for 2009 & 2010 Cayenne with steering wheel control retention for $299. It was not a simple job matching the adapter harness wires to the new head unit and I could not have done it without Spiral Audio's patient and prompt email responses to my sequential questions. Also, Crutchfield Customer Service was extremely helpful in relation to the Pioneer unit, antenna adapter and backup camera I purchased from them. After it all got hooked up and working, the bigger struggle was in pushing all that extra wiring and three adapters into the instrument panel, then finding ways to run the microphone, USB cable, and backup camera wiring out from behind the radio. Typical Porsche over-engineering. I am sorry I did not take photos as I went along as I doubted it would work. What a huge improvement to now have Bluetooth and Android Auto and CarPlay. And the factory Bose amplifier and speakers sound excellent(as they did before). Total cost under $1000 and well worth it for my daily driver which is still running strong at 116K miles.

 

Nice job! I also used Spiral Audio kit, all worked out. I had the same problem with packaging, so I ended up putting a strip of velcro on and mounting the audio adapter above the stereo. Mic was ran to the factory location in the overhead console.
I'm also in the process of retrofitting the OEM AUX kit with USB to the compartment b/w the seats. That way I have USB for charging and/or Android Auto hidden away.
Even though I lost some steering wheel functions, fader, and instrument cluster integration, the list of positives is much, much longer.

 

Interestingly, Customer Service at Crutchfield recommended placement of the microphone just above the steering wheel, clipped to the bottom of the instrument panel and directly in front of the driver. They said that this eliminates the wind noise present when the mic is placed near the rear view mirror, which is what many professional audio shops do. I think Crutchfield is right, most of my callers say it does not sound like I am using a microphone.

 

True, but then the passenger voice would not be picked up much at all. Factory microphone is placed in the overhead console, and there's extra insulation above it to somewhat mitigate the roof wind problem. Also, factory setup has 2 microphones up there and I suspect some noise cancelling software, so I'm sure my setup is not as good as factory. A compromise that I decided to go with and the results are acceptable to me.

 

Thanks for sharing that microphone tip. I've put off running mine yet but I started routing the wire that way anyway.
I bet the slightly parabolic shape of the curved, smooth plastic of the cluster along with the fact that its sort of concave like an awning help focus the sound.
I've also put off running my rear camera. Who has the best method?