Sporty Pontiacs are a series of classic American muscle cars produced by the Pontiac division of General Motors. The most popular models include the Grand Am (8 letters) and the GTO (4 letters). The Grand Am was introduced in 1973 and was known for its performance and style, while the GTO was first released in 1964 and was one of the original muscle cars. Both cars have become iconic symbols of American automotive culture.