IMSA WeatherTech Classes (Who's Racing Who)

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From fastest to slowest:

GTP: prototype cars denoted by white on black numbers, white headlights; transition period for new LMDh class; hybrid systems; Acura, BMW, Cadillac, Lamborghini and Porsche

LMP2: slower prototypes developed by Oreca; white on blue number, white headlights; privateer teams.

GTD Pro: based on street cars; white on red number, red wing, mirrors, windshield; white headlights; typically factory-sponsored; pro drivers

GTD: based on street cars; white on green number, green wing, mirrors, and windshield; yellow headlights; typically privateers; more novice drivers