Karting

Holzem began racing on the European karting scene in 2019, partaking in an event of the European Championship before participating in that year's Karting World Championship in Alahärmä.^[3][4] He proceeded to take part in various continental competitions throughout the subsequent years.

ADAC GT4 Germany

In 2022, Holzem made his car racing debut, teaming up with twin brother Juliano at Dörr Motorsport in the ADAC GT4 Germany.^[5] The season yielded little success, as a twelfth place during the final race at the Hockenheimring meant a 40th place in the standings for the Holzem brothers.^[6]

DTM

For the 2023 season, it was announced that Holzem would progress to the DTM with Project 1, entering the championship following an extensive testing programme and guest starts at the GTC Race and the ADAC GT Masters, the latter of which Holzem together with Marco Wittmann would score a podium in.^[7][8] Following the German's DTM debut at the Nürburgring, ADAC officials granted Holzem full entry to the series, subsequently enabling him to score championship points.^[9]

Racing career summary

* Season still in progress.

Complete ADAC GT4 Germany results

(key) (Races in bold indicate pole position) (Races in italics indicate fastest lap)

Complete Deutsche Tourenwagen Masters results

(key) (Races in bold indicate pole position) (Races in italics indicate fastest lap)

^† As Holzem was a guest driver, he was ineligible to score points.