KTM SRO GT4

2015

A modified KTM X-Bow was raced in the Supersport category of the 2008 FIA GT4 Championship. Catharina Felser, Christopher Haase, and Dennis Retera took a podium finish at Monza, and pole position in the wet qualifying session at Nogaro. Peter Belshaw and Marcus Clutton were the GT4 champions in the 2011 season of the British GT Championship in a modified X-Bow.

KTM teased a factory GT4 version of the X-Bow in 2014, which they would later unveil in 2015. The X-Bow GT4 was built in collaboration with Reiter Engineering and KISKA GmbH. The vehicle features a closed cockpit design to comply with class regulations. It also maintains the 2.0-litre turbocharged Audi inline-4 engine and the 6-speed Holinger sequential transmission, but both are modified for racing. To accommodate the rules and regulations, the wheelbase is extended by 17 cm. The X-Bow GT4 debuted in the 2015 GT4 European Series and took its first win in its debut at the Circuit Zandvoort round. It also powered Brett Sandberg to the 2016 Pirelli World Challenge GTS Championship with multiple wins. An upgrade was introduced in 2018 with improvements in durability and performance.

An evolution model for the X-Bow GT4 was released in 2019 as the X-Bow GT4 Evo. The update was directed towards increasing the car's straight-line speed while maintaining the cornering capabilities of the previous X-Bow GT4. It also received a power increase, now producing 375 hp (280 kW; 380 PS) under balance of performance.