The LF3 is the most powerful V6 ever from General Motors, it is also the most power-dense six-cylinder engine in the midsize luxury segment. In the CTS Vsport, the LF3 makes 420 horsepower (313 kW) and 430 lb. -ft. (583 Nm). ... GM 3.6 Liter Twin Turbo V6 LF3 Engine. Type:3.6L V6 Turbo Fuel type:Premium required Emissions controls Evaporative system BIN 4 53 more rows