McIntosh came to motorsport following a serious illness that nearly cost him his life. During his recovery he daydreamed about racing, and after purchasing a track day car he enrolled in the Lucas Oil School of Racing while waiting for its delivery. It was there he met Glenn McGee, the co-driver who would partner him through his subsequent championship campaigns.
His competitive debut came in 2021 with JTR Motorsports Engineering in the Mazda MX-5 Cup for a handful of rounds. He returned to the series full-time in 2022, posting a best finish of 14th at Road Atlanta and finishing 25th in the championship. That same weekend he also skipped a round at Virginia International Raceway to make his Lamborghini Super Trofeo North America debut, immediately scoring a class win in the LB Cup category.
McIntosh and McGee moved into the Super Trofeo Am class full-time in 2023 with Precision Performance Motorsports. After four podium finishes in the opening four races, they broke through with a class victory at Road America. That win sparked a run of five consecutive race victories as the duo swept the final two North American rounds at Virginia International Raceway and Indianapolis Motor Speedway, clinching the title with a race remaining. At the Vallelunga World Finals they were crowned World Finals Am champions, becoming the only American drivers to win a World Final in 2023. Their strategy of also entering two Super Trofeo Europe races at the World Finals weekend — gaining additional track time and setup data — proved decisive in taking that title.
For 2024 McIntosh moved to Wayne Taylor Racing to defend his crown. A class victory at Laguna Seca came after the original class-winning car failed post-race technical inspection. Weekend sweeps followed at Circuit of the Americas and Indianapolis Motor Speedway, and a sixth class win at Jerez confirmed back-to-back Am championships. At the World Finals, McIntosh partnered Brendon Leitch in the Pro/Am final and swept to the world title in that class, while narrowly missing a second World Finals crown in the Am class, finishing a single point behind winner Renaud Kuppens.
The 2024 season also saw McIntosh debut in GT3 machinery. Paired again with McGee in the Italian GT Championship Sprint division driving a Mercedes-AMG GT3, the duo were crowned Am-class champions. Additional outings that year included the 2024 Road to Le Mans and the inaugural 992 Endurance Cup.
In the Asian Le Mans Series during the 2024–25 off-season, McIntosh raced alongside Parker Thompson and Ben Barnicoat, claiming a class victory in the opening race at Dubai en route to sixth in the championship.
McIntosh opened 2025 at the 24 Hours of Daytona with Van der Steur Racing, driving alongside Rory van der Steur, Valentin Hasse-Clot, and Maxime Robin in the GTD class. He finished sixth in class on his IMSA SportsCar Championship debut and subsequently expanded his programme with the team to cover the full Michelin Endurance Cup. He also returned to Lamborghini Super Trofeo North America, stepping up to the Pro-Am class alongside Leitch. In June 2025 he made his debut at the 24 Hours of Spa with Beechdean Motorsport, co-driving with Hasse-Clot, Andrew Howard, and Ross Gunn to a second-place class finish and 32nd overall. Later in 2025 he made his FIA World Endurance Championship debut, replacing Derek DeBoer in Racing Spirit of Leman's entry at Interlagos.
McIntosh's company Global Power Components features prominently as a sponsor on his Lamborghini Super Trofeo race cars. Parker Thompson, who served as McIntosh's driver coach, worked with him across GT4 America and GT America competition during the 2025 season.
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