The game is based around tuning cars for street races, resuming the Need for Speed: Underground storyline. Need for Speed: Underground 2 provides several new features, such as a broader customization, new methods of selecting races, the "explore" mode (just driving around freely, like the Midnight Club series, in a large city known as "Bayview"). Underground 2 also introduces several SUVs, which could be customized as extensively as other Underground 2 vehicles and used to race against other SUV racers. Brooke Burke is the voice of Rachel Teller, the person who guides the player through the story.