Performance Parts featured in Need for Speed: Most Wanted (2005) are utilised to improve the top speed, acceleration and handling of a car. The Engine, Transmission, Suspension, Nitrous, Tyres, Brakes and Turbo Charger or Supercharger of a car can be upgraded. Each performance part category is also divided into upgrade packages. Each package offers greater performance gains for a car but some vehicles can not be equipped with certain lower level packages. The upgraded levels are Race, Pro, Super Pro and Ultimate.