The player's ability to customise their vehicle's performance was added in patch 5.00 on November 16th, 2010.
Parts can be purchased from the Performance Parts section of the Safehouse, acquired from Lucky Draw card packs by completing events, purchasing Performance Part card packs or completing Treasure Hunts.
Performance Parts can be equipped to alter a vehicle's engine, forced induction, transmission, suspension, brakes and tyres with each capable of altering the characteristics of a vehicle as well as improving its overall statistic performance.
The characteristic altering aspects of a performance part is portrayed by the colour of the icon for the part:
- Beige - Unbiased
- Blue - Bias towards acceleration
- Red - Bias towards handling
- Green - Bias towards top speed
Performance parts are divided into four main Stages; Street, Race, Pro and Ultra with each providing an increased margin of performance capabilities. Each stage is displayed by a star rating system and a background pattern with more stars alongside a different pattern representing a different stage;
- Street - Minute alteration in vehicle performance.
- Race - Marginal alteration in vehicle performance.
- Pro - Significant alteration in vehicle performance.
- Ultra - Intensive alteration in vehicle performance.
- Elite - Intensive alteration in vehicle performance.
The performance alterations of a part within a given stage can also differ depending on the Rarity of the part. Rarer parts offer an increase in performance compared to its common counterpart towards an aspect based on its colour. Rarity is divided into Improved, Sport or Tuned with each being represented by a different font colour;
- Improved - Standard performance part
- Sport - Slightly altered performance part
- Tuned - Moderately altered performance part
Custom parts are only found on certain Best in Class style cars and can not be obtained through any other means.
- Custom - Bespoke performance part
There are several fictional manufacturers that produced different stages of performance parts with each offering a vehicle altering series of characteristics and part rarities.
There are five Street Stage performance part manufacturers with four of them offering their parts of all rarities for a Cash price. They can be found within the Performance Shop section of the Safehouse.
There are four Race Stage performance part manufacturers with one of them offering parts equipped to some vehicles purchased with SpeedBoost. They can be obtained from either the Lucky Draw at the end of each event or by purchasing Silver, Gold or Platinum Performance Card Packs.
There are four Pro Stage performance part manufacturers. They can be obtained from either the Lucky Draw at the end of each event or by purchasing Gold or Platinum Performance Card Packs.
There are four Ultra Stage performance part manufacturers. They can be obtained from either the Lucky Draw at the end of each event or by purchasing Platinum Performance Card Packs.
Zero Tuning Mods
Quartz Speed Packages
Dynamo Aftermarket Kits