One of 25 models planned for production has been unveiled at Atlanta Motorsports Park. Russian tuning house TopCar has just revealed its first Panamera Stingray GTR in the US, which debuted at a private event at Atlanta Motorsports Park. Only 25 of these cars will be built, each with its own set of unique characteristics. We previously saw a blue and carbon-black model at the Top Marques Monaco 2012, and this particular model comes with similar aftermarket styling. That includes a host of carbon-fiber and Kevlar components including a front and rear bumper set, new hood, front & rear fender extenders and new side skirts. Source: Carbuzz