I have recently traded my '05 Boxster in for a new car. I had replaced the original head unit with a Pioneer Avic-Z1 about 6 months after receiving the Boxster. When I traded my Boxster in, the Pioneer Avic-Z1 went along with it. This is the head unit that came with the sound package plus option and the part number is 997.645.128.04. This unit was only in use for 6 months. I asking $900 for the unit.