The Gunther Werks "Project Endgame" Turbo Speedster is a one-off final edition of the GW Speedster line, and channels a well-known superhero. Project Endgame houses a 4.0-liter twin-turbocharged flat-six making 840 horsepower and 660 pound-feet of torque, while the car itself weighs 2600 pounds. Extensively modified from a 993 Porsche 911, the Endgame is one of 75 GW Turbos slated for production, though it will remain the only example with an open top.