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.

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 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 SeasonSeriesTeamPosition 2009Göteborgs Stora Pris – MiniDNF 2010Norwegian Championship – Formula Yamaha12th 2011Norwegian Championship – Formula Yamaha8th 2012Norwegian Championship – KZ224thSources:

Racing record Racing career summary Season Series Team Races Wins Poles F/Laps Podiums Points Position2012 Formula Basic – Norwegian Cup 66 4th Formula Basic – Factor-X Cup 4 2 1 0 2 47 8th Formula Basic – Norwegian Championship 1st 2013 Formula Basic – Norwegian Cup NMK Sör-Gudbrandsdal 10 7 4 5 8 1851st2016 GT4 European Series – Pro RYS Team Hohenberg 9 2 0 1 4 112.52nd British GT Championship – GT4 1 0 0 0 0 0 NC†2017 GT4 European Series Northern Cup – Silver RYS Team InterNetX 10 0 0 1 16612th RYS Team True Racing 2 0 0 0 02018 Blancpain GT Series Endurance Cup Reiter Young Stars4 0 0 0 0 0 NC Blancpain GT Series Endurance Cup – Silver 0 0 0 1 36 11th GT4 Central European Cup – Pro-Am K Racing - Reiter 2 1 0 1 1707th True Racing - Reiter 2 1 0 1 1 GT4 European Series – Silver Felbermayr - Reiter 2 0 0 0 1 0 NC†2019 GT4 European Series – Silver Valvoline - True Racing 12 0 1 1 1 30 12th ADAC GT4 Germany Felbermayr - Reiter 12 2 2 2 4 1491st2020 GT4 America SprintX – Silver Marco Polo Motorsports 14 3 5 4 7 186 4th ADAC GT4 Germany Dörr Motorsport 2 0 0 0 0 0 NC†2021 GT4 America Series – Silver Marco Polo Motorsports 6 0 0 1 1 67 8th 24H GT Series – GTX Reiter Engineering 4 3 0 0 4 812nd Nürburgring Langstrecken-Serie – Cup X Teichmann Racing GT4 2 0 0 0 1 0 NC Stadium Super Trucks N/A 2 0 1 0 0 19 20th2022 Le Mans Cup – LMP3 Reiter Engineering 7 1 2 0 3 732nd Prototype Cup Germany 2 1 0 0 2 41 11th Nürburgring Langstrecken-Serie – SPX True Racing 3 0 0 0 0 0 NC 24 Hours of Nürburgring – SPX KTM True Racing 1 0 0 0 0 DNF 2025 GT4 America Series – Silver Marco Polo Motorsports 9 0 1 0 2 77 9th 2026 GT World Challenge America – Pro-Am Chicago Performance and Tuning Co. 1 0 0 0 0 4* 8th*Sources:

† 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) Year TeamCarClass 1 2 3 4 5 6 7 8 9 10 11 12 Pos Points 2016 RYS Team Hohenberg KTM X-Bow GT4 Pro MNZ1 MNZ2 PAU1 PAU2 SIL SPA HUN1 HUN2 ZAN1 ZAN22nd112.52017 RYS Team InterNetXKTM X-Bow GT4Silver MIS1 MIS2 RBR1 RBR2 SVK1 SVK2 ZAN1 ZAN2 NÜR1 NÜR212th66 RYS Team True Racing BRH1 BRH2 2018 Felbermayr - Reiter KTM X-Bow GT4 Silver ZOL1 ZOL2 BRH1 BRH2 MIS1 MIS2 SPA1 SPA2 HUN1 HUN2 NÜR1 NÜR2 NC† 0† 2019 Valvoline - True Racing KTM X-Bow GT4 Silver MNZ1 MNZ2 BRH1 BRH2 LEC1 LEC2 MIS1 MIS2 ZAN1 ZAN2 NÜR1 NÜR2 12th 30

Complete GT World Challenge Europe results GT World Challenge Europe Endurance Cup Year Team Car Class 1 2 3 4 5 6 7 Pos. Points 2018 Reiter Young Stars Lamborghini Gallardo R-EX Silver MNZ SIL LEC SPA6H SPA12H SPA24H CAT 11th 36

Complete ADAC GT4 Germany results (key) (Races in bold indicate pole position) (Races in italics indicate fastest lap) Year Team Car 1 2 3 4 5 6 7 8 9 10 11 12 DC Points 2019 Felbermayr - Reiter KTM X-Bow GT4 OSC1 OSC2 RBR1 RBR2 ZAN1 ZAN2 NÜR1 NÜR2 HOC1 HOC2 SAC1 SAC21st149 2020 Dörr Motorsport McLaren 570S GT4 NÜR1 NÜR2 HOC1 HOC2 SAC1 SAC2 RBR1 RBR2 LAU1 LAU2 OSC1 OSC2 NC† 0†

Complete Le Mans Cup results (key) (Races in bold indicate pole position; results in italics indicate fastest lap) Year Entrant Class Chassis 1 2 3 4 5 6 7 Rank Points 2022 Reiter Engineering LMP3 Ligier JS P320LECIMOLMS1LMS2MNZSPAALG 2nd 73

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