The starting field of the Grand-Am Series is formed of two vehicle classes - the so-called Daytona Prototypes and the GT vehicles. The technical regulations for the two classes are designed to produce exciting races at comparatively low costs by restricting the development scope as well as by using standard components and racecar standards very close to those of production vehicles.

The Grand-Am GTs are 390 - 450 hp racecars that are derived from standard production GT sportscars or coupés. The different vehicle and engine concepts are balanced out in the regulations on the basis of vehicle weight, tyre sizes or speed limit. The GT class is therefore currently similar to the European FIA GT3 category.

Various Porsche teams take to the start line in a 911 GT3 Cup "Grand-Am", lining up against cars based on the Camaro GT.R, Pontiac GTO/GXP, Ford Mustang, Mazda RX-8, BMW M3 or Ferrari 430.

The Daytona Prototypes are thoroughbred mid-engine racecars. The vehicle chassis are supplied by specialist manufacturers licensed by the Grand-Am such as Riley, Crawford, Dallara or Lola. All chassis designers have to stick to prescribed vehicle dimensions and standard components such as the rear wing, with the teams only allowed to make minimal changes.

To keep the field level, large car manufacturers are not allowed to enter their own teams - their involvement is restricted to providing the engines. The racing engine does approx. 510 hp in the setting for Daytona Prototypes. The minimum weight of the racing car is 1,021 kilograms.