Grand Prix offers a sedan in base SE trim and sedans and coupes in sportier GT form and in high-performance GTP versions. All have a V6 engine: the SE a 3.1 liter, GTs a 3.8, GTPs a supercharged 3.8. Automatic transmission, antilock 4-wheel discs, traction control, and tire inflation monitor are standard. General Motors' OnStar assistance system and head-up instrument display are standard on GTP, optional on GT. Grand Prix shares its platform with the Buick Century and Regal and the Oldsmobile Intrigue, but only Pontiac offers a coupe body style.