The yellow and black racer looks like a worthy competitor to take on fellow exotic racers like the Lamborghini Huracan GT3 that debuted at the 24 Hours of Daytona.
The 650S GT3 is nearly track-ready when it leaves the factory, but McLaren makes changes for competition, such as the addition of dive planes to help stick the front of the car to the road, the enormous rear wing to provide downforce, and a set of Pirelli PZero racing tires.
The racer includes hidden features such as a 125-liter racing fuel tank with a quick-fill connector for rapid pit stop refueling. Underneath, it has built-in air jacks, so the pit crew need only snap in an air line when the car comes in for service, and it pops up off the ground for quick replacement of its Pirellis.
Inside, the McLaren has a carbon fiber racing seat, six-point racing harness and adjustable racing pedals. A lighter-weight carbon fiber dash panel houses the driver's information display, and a fire extinguisher is included in case of an emergency.
The stripped-down cabin includes auxiliary power for the driver's radio and specialized computers for engine management and anti-lock braking.
Under the hood is a race-prepared version of the 650S's 3.8-liter twin-turbo engine. GT3 racing class rules limit power to less than the street car's output of 650 horsepower to equalize all the cars in the race.
For any more revelations, we'll just have to wait to see the car in Geneva.