The discerning owner of this glass topped 996 wasn't at all happy with the performance of the factory PCM navigation system and Bose sound pack, despite the original owner paying thousands of pounds extra for them when new! We replaced the PCM system with a Touchscreen, hard drive based, bluetooth Pioneer AVIC-HD1BT, and installed upgraded DLS front speakers, and a pair of 6" DLS subwoofers in a custom stealth sub enclosure behind the rear seats. As can clearly be seen in the photographs, it looks very invisible(!?) so security is not compromised at all.