They are given by Amy, who is determined to have her work and shop noticed by Build Icon Nakai-san. Completing a high number of events will reward the player his "Stella Artois" Porsche 911 Carrera RSR 2.8. The final mission objective sees the player with Amy and Nakai-san beating the longest Time Trial event in the game. Build Mission completions are required to unlock specific higher level performance parts that cannot be unlocked otherwise.