The name is drawn from the Enzo-based FXX that kicked off the company's client development program the better part of a decade ago, but with an extra letter tacked on to signify the KERS hybrid system on board. In the FXX K, that system has been further optimized: the electric motor now delivers 187 horsepower (instead of 160) and the 6.3-liter V12 has been boosted to 848 hp (up from 789) for a total output of 1,035 prancing ponies. The front end gets a two-part splitter derived from Ferrari's victorious GT racing program, with vertical fins along the flanks, side skirts extending between the wheels, a dynamic rear wing, vertical fin and a giant diffuser. All of this and more contributes to as much as 50 percent more downforce, aided by increased mechanical grip from the Pirelli racing slicks, with carbon-ceramic brake discs measuring 15 inches across (plus or minus, front to rear) to keep it all in check.