My research did not retrieve the film's full ending, so I describe only the plot points I could confirm. Nick and Noah race in the countryside and end up at William Leister's country home. Nick loses a race to Cruz, who cheats, and Noah offers Cruz a rematch. Jenna is arrested when police arrive. After the Spice Girls night, Nick and Noah quarrel and have sex, and she writes "You're mine" on his wrist. She then learns he was in Sophia's hotel room, goes to race Cruz, and narrowly avoids a spike strip set by Ronnie's agents. Cruz drives over it and crashes into a wall.
In the book's Spanish-language adaptation, the parents' reaction and an ultimatum structure the final act. Beyond that, I can't reliably describe this film's resolution.