The owner of this Cayenne couldn't find the exact spec he was after, so ended up buying the car without PCM2 sat nav. After being quoted £3.5k by Porsche to retrofit this, he approached Prestige to see what alternatives he had. We designed a system based around the Alpine Double DIN touchscreen head unit with intergral iPod interface and DVD player, connected to the latest Alpine DVD based navigation system. The source feeds into a DLS 4 channel amplifier which powers DLS 3 way front speakers in the factory allocations and a Diamond Audio D1 10" subwoofer behind the stealth panel in the boot.