IMSA WeatherTech Classes (Who's Racing Who)

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From fastest to slowest:

DPi: prototype cars denoted by white on black numbers, white headlights; typically factory-sponsored

LMP2: slower prototypes developed by one of four manufacturers; white on blue number, white headlights; privateers

GTLM: based on street cars; white on red number, red wing, mirrors, windshield; white headlights; typically factory-sponsored

GTD: slower street car-based vehicles; white on green number, green wing, mirrors, and windshield; yellow headlights; typically privateers