The Ferrari FXX-K is a high performance limited production track day car. It succeeds Ferrari's previous developmental track day offerings, the FXX and the 599XX. The K in the new car's name is refers to the kinetic energy recovery system (KERS) which is used to maximize performance. The hybrid powerplant used in the FXX-K has a total power output of 1,050 PS (772 kW; 1,036 hp) and over 900 N⋅m (664 lb⋅ft), of which 860 PS (633 kW; 848 hp) are delivered by the V12 ICE and 190 PS (140 kW; 187 hp) by the electric motor. The V12 engine has been tuned for track use as well as the HY-KERS system. A total of 40 vehicles were reportedly built.