Nitrous is a vehicle component that can be installed on modifiable vehicles in the three available mod garages around the state. When installed on a vehicle, the "fire" button can be pressed to activate nitrous. Nitrous will increase the speed and acceleration dramatically, along with exaggerated motion blur and bright blue flames spewing out of the exhaust pipe(s). After a few seconds the nitrous exhaust ceases and the vehicle may revert back to its normal top speed. The boost is followed by a delay that won't allow a player to use another boost right away.
To know when you can fire a Nitro boost again is to look at the exhaust after a depleted boost. If the fumes are colored blue, the boost is still in its "delay" state. If the fumes revert back to the normal, grey fumes, then the Nitro is ready to be fired again.
All mod garages have nitro as an available part. nitro comes in three "strengths:" 2x, shown with a small tank; 5x, with a large tank; and 10x, with 2 small tanks. Each option determines how long you can use a Nitro boost.
Nitrous is limited on during races. The boost can be controlled. A small bar next to the radar will show the amount of nitrous available. The amount will regenerate after some time.