The GT4 was introduced in 2015 as a variant of the KTM X-Bow. It was the first version of the X-Bow designed specifically for FIA GT4 racing, developed in collaboration with Reiter Engineering. Based on the carbon monocoque chassis of the original X-Bow, the GT4 adopts a closed body with a hardtop canopy, which improves rigidity and safety for competition. It retains rear-wheel drive and is powered by a 6-speed sequential transmission, paired with Audi's 2.0L turbocharged inline four engine.