 Complete the following phrase:  When it was launched, the GT R had several cosmetic changes compared with the standard car, notably the vertical slats in the front grille, an adjustable rear wing, new front air intakes and new front and rear diffusers. The styling of the GT R is more comparable to that of the AMG GT3 race car. However, the base GT variant gained several of these cosmetic changes as part of a mild facelift in the 2017 model year. The GT R went on sale in November 2016, with deliveries beginning in 2017. For the 2018 Formula One World Championship, the GT R became the official Formula 1 safety car. During the 