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Unlike Need for Speed: Hot Pursuit 2, Need for Speed: Underground incorporates customization. The customization is completely different than Need for Speed: High Stakes. The game allows you to extensively change your car's visual and performance with the exchange of in-game currency. Performance upgrades comes in packages with Level 1, Level 2, Level 3 and Unique performance packages. You also choose which brands you want to supply the parts. Visual upgrades are 'rated' as either Level 1, Level 2, Level 3, or Unique upgrades, the latter increases your star rating the most. You can modify the engine/exhaust, the drivetrain, the tires, the ECU/fuel system, the brakes, the suspension, the front and rear bumpers, the hood, the rims, the headlights and taillights, the muffler tip, the base paint, the rim paint (if you have custom rims), the spoiler paint (if you have a custom spoiler), the engine accent paint (if you have Level 3 engine/exhaust, Level 3 ECU/fuel system, and Level 3 turbo), the brake paint (if you have Level 1-3 brakes), the roof scoop paint (if you have a roof scoop), and the mirror paint (if you have custom mirrors). You can also add weight reduction, nitrous oxide, a turbo, side skirts, a spoiler, a roof scoop, a neon, window tint, decals to the windshield, rear window, left and right doors, and left and right rear quarter panels, and up to four vinyls. There is also unique performance and visual upgrades that TJ and Samantha will occasionally give to you in exchange for beating a time trial. You also have a choice of one of two unique wide body kits near the end of Underground mode that replaces the front and rear bumpers and side skirts. Once you purchase a performance or visual upgrade, you do not have to pay for it ever again, even if you uninstall it. If you trade in your car for another one, the performance and visual upgrades from your previous car will automatically be applied.

Performance Upgrades[edit]

Part Cost Unlock
Level 1 Engine/Exhaust Package 500 Beat 6 events in Underground mode.
Level 1 Drivetrain Package 500 Beat 6 events in Underground mode.
Level 1 Tire Package 500 Beat 6 events in Underground mode.
Level 1 ECU/Fuel System Package 1000 Beat 9 events in Underground mode.
Level 1 Turbo Package 1000 Beat 9 events in Underground mode.
Level 1 Brake Package 1000 Beat 9 events in Underground mode.
Level 1 Weight Reduction Package 1500 Beat 14 events in Underground mode.
Level 1 Suspension Package 1500 Beat 14 events in Underground mode.
Level 1 Nitrous Package 1500 Beat 14 events in Underground mode.
Level 2 Engine/Exhaust Package 1000 Beat 30 events in Underground mode.
Level 2 Drivetrain Package 1000 Beat 30 events in Underground mode.
Level 2 Tire Package 1000 Beat 30 events in Underground mode.
Level 2 ECU/Fuel System Package 2000 Beat 38 events in Underground mode.
Level 2 Turbo 2000 Beat 38 events in Underground mode.
Level 2 Brake Package 2000 Beat 38 events in Underground mode.
Level 2 Weight Reduction Package 3000 Beat 48 events in Underground mode.
Level 2 Suspension Package 3000 Beat 48 events in Underground mode.
Level 2 Nitrous Package 3000 Beat 48 events in Underground mode.
Level 3 Engine/Exhaust Package 2000 Beat 66 events in Underground mode.
Level 3 Drivetrain Package 2000 Beat 66 events in Underground mode.
Level 3 Tire Package 2000 Beat 66 events in Underground mode.
Level 3 ECU/Fuel System Package 4000 Beat 80 events in Underground mode.
Level 3 Turbo Package 4000 Beat 80 events in Underground mode.
Level 3 Brake Package 4000 Beat 80 events in Underground mode.
Level 3 Weight Reduction Package 6000 Beat 91 events in Underground mode.
Level 3 Suspension Package 6000 Beat 91 events in Underground mode.
Level 3 Nitrous Package 6000 Beat 91 events in Underground mode.
Unique Engine/Exhaust Package, Drivetrain Package, or Tire Package N/A Beat 7 events in Underground mode.
Unique Drivetrain Package, Tire Package, ECU/Fuel System Package, Turbo Package, or Brake Package N/A Beat 26 events in Underground mode.
Unique Drivetrain Package, Tire Package, ECU/Fuel System Package, Weight Reduction Package, Suspension Package, or Nitrous Package. N/A Beat 97 events in Underground mode.