What is a blueprint and how do I use it?

Blueprints are used to upgrade different parts of your car and improve your car's overall performance.

There are 4 grades of blueprints: white, blue, yellow and black (the highest one). Higher-grade blueprints usually result in better performance.

Blueprints drop from winning different races (Underground, Toyo, Live Races, and so on).

You can also buy blueprints on the in-game market.

To use blueprints:

After receiving the blueprint, you can find it in your Storage (Garage -> Items). You will also see it when you enter the Upgrade section in your Garage.
If you've got the cash and kits required to install the blueprint, go to the upgrade section of the car and parts. You should see the blueprint icon on the bottom - just tap it and click install!