Performance parts are available as one of six part types and improve different performance aspects of a vehicle: * Top Speed - Engine, Turbo * Acceleration - Gearbox, Wheels * Nitro - ECU, Nitro The effectiveness of a part is determined by its rarity rating, with rarer parts giving higher performance increases than parts that are less so. The rarity classes are: Each performance part is categorised in a car class - players are unable to install performance parts for a different class.