The IMSA VP Racing Sportscar Challenge is a North American auto racing series for LMP3, GT3 (run as the GTDX class), and GT4 (run as the GSX class) vehicles.

[1] The IMSA VP Racing Sportscar Challenge retained LMP3 class cars from the Prototype Challenge series, but introduced GT4 cars to allow for multi-class racing.

[2] Beginning in 2025, the series introduced a third class, GTDX, open to GT3-specification cars.

[3] The series features two 45-minute races per event weekend with no mid-race pit stops or driver changes.

[5] The series is currently sponsored by VP Racing Fuels.