Russian tuner, Topcar, has apparently been on a mission to develop the biggest and baddest tuning package for the Porsche Panamera Turbo. They started off with the creation of a 542 HP Panamera and then went to sketches of a newer 600 HP model before finalizing their package with a maximum output of a whopping 700 HP! The Porsche Panamera Stingray GTR will be limited to only 25 units, with each tuning upgrade priced at 45,000 euro, or about $63,500 at the current exchange rates. By the way, four of them have already been sold.[...]