Is PCM II something that can be retrofitted, or am I just out of luck that I didn't get it in the first place. I've currently got just the base Bose system and was hoping to get some kind of navigation system, but everything on the market with a full screen (not the Garmin Street Pilot)seem to be in the $2,500-$4,000 range. I figure for that money, I could probably buy the PCM system. Is that possible?

If not, does anyone have a navigation system solution for the Cayenne?

 

Yes, PCMII is designed to be "retrofittable"... but I don't know if it is currently available/in stock.
Check under "Tequipment" for details.
J