All the items the owner did, that you listed, are great to have been done when you buy a used car but unfortunately don't count towards the real value of the car. What came on the car new are items that count towards the value such as full leather interior, Automatic trans, upgraded wheels and etc. If you go to Edmunds or Kelley Bluebook and answer the questions about the car they will give you a trade in value and a sell it yourself value. Unfortunately for older Boxsters the figures are disappointing as they have dropped through the floor in value.
What does have value is how you feel about the car and the enjoyment it gives you while you own it and fortunately Boxsters are one of the most fun cars to drive so don;t worry about getting a deal of a lifetime because chances are it won't be in the monetary value but in the experience of driving it.
