Devon GTX
You might remember the Devon GTX sports car. The project caused quite a big stir when it was born in 2009. The vehicle was conceived as the ultimate American sports car. It used a Dodge Viper RT10 basis and engine but with numerous modifications and power upgraded to 650 HP. The GTX used the same six-speed manual and had improved performance and top speed. It broke a few track records during testing, but nothing was official (via Silodrome).
Unfortunately, the economic downturn and recession of 2009-10 hit the car industry especially hard and caused significant problems among the car makers. Chrysler decided to kill the Viper project and discontinue the production of platforms and engines, thus affecting Devon’s output of the GTX. Devon tried to buy the rights to Viper’s platform. But Chrysler rejected the bid. That sunk Devon as a company and only a few cars ever left the factory as pre-production examples.