Career progression uses two different resource layers. G Credits pay for cars, facilities and Workshop structure levels, while performance parts consume three crafting materials: Alloys, Circuits and Components. Different upgrade branches use different combinations, so no single material replaces the others.
| Material | Color | Early use |
|---|---|---|
| Alloys | Orange | Body, tires and aero upgrades use them in different combinations. |
| Circuits | Green | Common in engine, tire and aero upgrades. |
| Components | Purple | Used in engine and body upgrades and valuable early because some events award them in smaller quantities. |
Early Duels are a useful source of Circuits and Components, while other events can award different combinations. The Unlimited multiplier is applied to the materials earned from the event.