Rapid Stream is an installable performance-enhancing component for Extreme Gears. Its actual appearance is unknown, though it is presented as an icon on the head-up display in the top-left corner of the game screen. Its icon is orange with the image of three gusts inscribed in it.
In gameplay, Rapid Stream is a customizable Gear Part that can only be attached to different Extreme Gears. It can be bought from the shop for 400 Rings after the player has completed Team Heroes's story.
When in use, Rapid Stream will increase the maximum speed of its Extreme Gear while in a rival’s slipstream until the player deactivates it or finishes the race.
If Rapid Stream is installed into the front slot, it becomes active in gameplay once the race begins. If installed into the rear slot, however, the player can activate, and as well deactivate, Rapid Stream by switching stance by turning his/her body around due to the Kinect controls of the game.