For drivers, collectors and automobile enthusiasts, Aug. 13-16, 2025 had already been highlighted on their calendars for the historic racing event of the year—the Rolex Monterey Motorsports Reunion that celebrated the 75th Anniversary of Formula One®.

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The high-pitched revs of F1 were a stark contrast to the deep-throated rumble of cars from the original IROC (International Race of Champions) series, which held races from 1973 to 2006. For the first time since 2002, IROC returned to the West Coast with an incredible display of authentic IROC race cars, with many piloted by past IROC competitors from NASCAR, Formula One, IMSA, INDYCAR and Trans-Am.