The American Way

Mark Gillies
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Spotters' Guide to Grand-Am Classes

Daytona Prototype (DP)
Chassis: Tube frame, carbon-fiber body panels
Engines: Production-based, up to 5.0-liter V-8, 500 hp
Transmissions: 5- or 6-speed sequential manual
Weight: 2275-2325 lb
Top speed: 195 mph

Grand Touring (GT)
Chassis: Tube frame or unitary, carbon-fiber body panels permitted
Engines: Production-based, defined by Grand-Am, 390-450 hp
Transmissions: 5- or 6-speed sequential manual
Weight: 2260-2860 lb
Top speed: 180 mph

Grand Sport (GS)
Chassis: Unitary, production body panels
Engines: Modified production, 350-405 hp
Transmissions: Production, manual
Weight: 2700-3300 lb
Top speed: 160 mph +

Street Tuner (ST)
Chassis: Unitary, production body panels
Engines: Modified production 4- and 6-cylinder, 250-300 hp
Transmissions: Production, manual
Weight: 2350-3100 lb
Top speed: 130 mph +

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