500 XLR8

From Grand Theft Wiki

The 500 XLR8 is a sports car featured only in Grand Theft Auto: Chinatown Wars. It is one of the fastest cars in the game, and one of the three cars protagonist Huang Lee must steal in the mission The Wheelman. Otherwise, the car is only unlocked if the player gets a bronze medal in all Algonquin races, and then becomes available for purchase at the BOABO merchant.Its based on the mazda RX8; the body and headlight design, and the fact that the characters, R, X, and 8, are in the car's name.