There are three types of Nitrous Purge upgrades; Type 1, Type 2 and Type 3. Players can select different nozzles for every category. Coloured nitrous sprays are only available for upgrades using every nozzle.
Nitrous Purge can only be purchased after installing any Nitrous upgrade. Doing so will automatically equip the player's vehicle with a Type 1 Nitrous Purge.
|Type 1||-||0,00||Available from the beginning of the game|
|Type 2 (Standard)||100||0,10||Find the Car Specialties Shop in Beacon Hill|
|Type 3 (Standard)||200||0,20||Complete 7 races in Stage 4|
|Type 2 (Colours)||300||0,40||Complete 7 races in Stage 4|
|Type 3 (Colours)||300||0,40||Complete 7 races in Stage 4|
|Customisation in Need for Speed: Underground 2|