Mads Siljehaug

Mads Emil Hørlyk Siljehaug (born 6 February 1996) is a Norwegian racing driver competing in GT World Challenge America for Chicago Performance and Tuning Co. A former Reiter Engineering stalwart in GT4 and LMP3, he is the 2019 ADAC GT4 Germany champion and 2022 Le Mans Cup runner-up.

Career Siljehaug made his single-seater debut in 2012, racing in Formula Basic and winning the Norwegian Championship in his rookie year, and the Norwegian Cup the following year. After a two-year hiatus, Siljehaug joined KTM-affiliated Reiter Engineering to race in the GT4 European Series as a member of the team's Young Stars programme. In his first season in the series, Siljehaug took an overall win at Zandvoort and a Pro class win at Spa to secure runner-up honors in points. Remaining with the team for 2017, Siljehaug took a lone podium at Zandvoort to end the year 12th in the Silver Cup standings.

Siljehaug driving Reiter Engineering's Lamborghini at Monza during the 2018 Blancpain GT Series.

After winning the Reiter Young Stars competition in late 2017, Siljehaug continued with the team to make his GT3 debut in the 2018 Blancpain GT Series Endurance Cup. Racing a Lamborghini Gallardo R-EX at all events except the 24 Hours of Spa, he scored a lone Silver Cup podium at Le Castellet alongside Patric Niederhauser and Lennart Marioneck. During 2018, Siljehaug made select appearances for the team's GT4 squad, most notably winning twice in the GT4 Central European Cup. In 2019, Siljehaug settled for a dual campaign in the GT4 European Series and the newly-created ADAC GT4 Germany. In the former, Siljehaug qualified on pole at both Misano and Zandvoort, as well as taking his only podium in the latter round en route to a 12th-place points finish in the Silver Cup. In ADAC GT4, Siljehaug scored wins at Zandvoort and Sachsenring and a pair of second-place finishes to secure the title for Felbermayr - Reiter.

Staying in GT4 competition for 2020, Siljehaug switched to the GT4 America SprintX series with fellow KTM-fielding team Marco Polo Motorsports. In his first season in the series, Siljehaug took overall wins at Sonoma and Road America, as well as four other Silver Cup podiums to end the year fourth in points. During 2020, Siljehaug also made a one-off return to ADAC GT4 Germany with McLaren-fielding Dörr Motorsport at the Red Bull Ring. Returning to Reiter Engineering for the following year, Siljehaug raced with them in select rounds of the 24H GT Series in the GTX class. Racing a KTM X-Bow GTX Concept, Siljehaug scored wins at Mugello, Le Castellet and Barcelona to secure runner-up honors in the class standings. During 2021, Siljehaug also raced for Marco Polo Motorsports in the first three rounds of GT4 America, taking a class podium at Sonoma, as well as making a one-off appearance in Super Super Trucks at Long Beach, taking pole for race two.

Siljehaug on his way to second in LMP3 at the 2022 Road to Le Mans.

Siljehaug switched over to LMP3 in 2022, joining Freddie Hunt in the Le Mans Cup as Reiter undertook its first prototype campaign. At the wheel of a Ligier JS P320, Siljehaug won at Algarve and scored maximum points in race two at Le Mans as he ended the year runner-up in points. During 2022, Siljehaug also raced for the team's "True Racing" banner in select rounds of the Nürburgring Langstrecken-Serie in the SPX class. After competing in time attack events throughout the following two years, Siljehaug returned to competitive racing in 2025, joining Marco Polo Motorsports to race in the GT4 America Series. Racing a Toyota GR Supra GT4 Evo2 for select rounds, Siljehaug scored Silver Cup podiums at Road America and Barber, as well as a pole at Sonoma en route to ninth in points. The following year, Siljehaug joined Lamborghini-fielding Chicago Performance to make his GT World Challenge America debut in the Pro-Am class.

Karting record Karting career summary

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

Complete GT4 European Series results (key) (Races in bold indicate pole position) (Races in italics indicate fastest lap)

Complete GT World Challenge Europe results GT World Challenge Europe Endurance Cup

Complete ADAC GT4 Germany results (key) (Races in bold indicate pole position) (Races in italics indicate fastest lap)

Complete Le Mans Cup results (key) (Races in bold indicate pole position; results in italics indicate fastest lap)