Your car is composed of numerous parts, each susceptible to damage and upgradable. These include Tires (Standard, Off-Road, Armored), Doors (Standard, Reinforced), Panels (Hood, Trunk, Side Panels), Engine, Battery, and various utility modules (Storage Racks, Roof Racks, Headlights). Each part can be crafted or found and then installed. Upgrades often require blueprints, which are discovered through exploration or mission progression. Prioritize upgrading parts that are frequently damaged or those that enhance your primary mode of travel, such as tires for better traction or an upgraded engine for speed and fuel efficiency. Some sources suggest focusing on defensive upgrades first.
