In order to make a good decison you need good data. The best indicator of what to expect is to obtain the Manheim Market Report (MMR) on the Porsche. It's what most all dealers use for used car valuations and you have to be a dealer to obtain it. It calculates the average sale price for the vehicle across all dealer auctions in the country and tells you the average price It's bringing at that exact moment in time. Adjust up for what should be exceptional condition and down for the opposite. Hopefully someone involved in the business with access to this number will see this and help you out. I'm not involved in the business but an old neighbor of mine was a used car dealer who would take me to auctions from time to time. He educated me on some things and obtaining the MMR was one of them.
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