Among the changes are a body that is completely reshaped compared with the road car. This includes the massively enlarged front grille, wider fenders and aggressive aerodynamic parts. The engine is based on the road car's twin-turbo 4.0-liter V8 and retains the same displacement, but it has been rebuilt for race duty. Power numbers aren't available. The engine is also mated to a six-speed sequential transmission, rather than the seven-speed dual-clutch unit in the road car. Other race-ready upgrades include several adjustable parts including the limited-slip differential, shocks, traction control and ABS. Those come standard, but there are some options such as a rear-view camera, parking sensors and tire pressure monitoring.
Though power hasn't been announced, pricing has. For teams not directly backed by McLaren, the price for a 720S GT3 is $564,000. That's roughly twice the cost of the road-going 720S, which starts at a bit over $280,000. Deliveries will begin next year in time for a number of GT3-class racing series.