Not really sure why it hasn't sold other than it's in the upper end of the range that Pantera's usually trade in.
It looks to be a very nice car and I agree with the previous posts that it's worth the asking price. I doubt you could duplicate this car for $56k if you bought a run-of-the-mill car and paid for comparable work and features. -Many hours sitting there.
If you're considering purchasing the car, you may want to inquire about how it was brought into the country and how it is currently licensed. There are some potential problems licensing Euro cars depending upon your state and the previous licensing history.
Euro GTS cars (if it indeed is) had some performance/drive train upgrades where US spec versions were basically a cosmetic package (I own a US GTS). Good luck.
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