1987 Buick Regal GNX, fastest American production car of 1987. Under-rated by Buick out of the factory at 275 horsepower and 360 foot-pounds of torque; the actual numbers were closer to 305 horsepower and 403 foot-pounds of torque. 3.8 Litre EFI V6 (front engine rear drive) Turbocharged/Intercooled