[3] For 2013, Stolz began competing in sports car racing, joining Land Motorsport for the 2013 Porsche Carrera Cup Germany season.

He made his GT World Challenge Europe Sprint Cup debut the following season, driving alongside Lucas Wolf for HTP Motorsport.

For 2016, Stolz joined the Lamborghini GT3 Junior Program,[5] which led to a full-season GT World Challenge Europe campaign with GRT Grasser Racing Team.

After competing with Black Falcon in 2019 and Haupt Racing Team in 2020, Stolz and Engel joined Toksport WRT for the 2021 season.

[15] His primary program for 2023 involved a sophomore DTM drive, where he claimed four podiums and a race victory at the Sachsenring.