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Players in Need for Speed: Underground are allowed to modify their vehicle's performance by purchasing performance packages. Each performance package must be unlocked in Underground Mode in a specific event.

Every package is categorized as Street, Pro and Extreme. The latter offers the highest performance increase. Players may also select between various brand packages, which do not have any difference in performance between them.

Street Performance Packages

Engine/Exhaust Package
Content
Brand Packages
Cold Air Intake System
Cat-Back Exhaust System
Replace Headers
Package 1: AEM, Aerospeed, DC Sports, Injen Technology, HKS USA
Package 2: NEUSPEED, Jackson Racing, HP Racing, Stillen, Venom
Package 3: Skunk2 Racing, Borla, A'PEXi, GReddy
Package 4: 5Zigen, Skunk2 Racing, A'PEXi
Increases Acceleration Unlocked after completing Challenge #6. Price: 500
Drivetrain Package
Content
Brand Packages
Short Throw Shift Kit
Shifter Stabilizer Kit
Replace Clutch
Lightened Flywheel
Package 1: Arospeed, Clutchmasters, Stillen
Package 2: NEUSPEED, DC Sports, ACT
Package 3: Jackson Racing, HKS USA, Stillen
Increases Top Speed Unlocked after completing Challenge #6. Price: 500
Tires Package
Content
Brand Packages
Street Performance Tire Package Package 1: Toyo Tire
Package 2: Yokohama
Package 3:Kumho Tires
Increases Handling Unlocked after completing Challenge #6. Price: 500
ECU & Fuel System Package
Content
Brand Packages
Performance Chip Package 1: Jackson Racing, Venom, Stillen
Package 2: AEM, GReddy, Skunk2 Racing
Package 3: A'PEXi, Jackson Racing, Stillen
Increases Acceleration and Top Speed Unlocked after completing Challenge #9. Price: 1,000
Turbo Package
Content
Brand Packages
Stage 1 Turbo Kit Package 1: HKS USA
Package 2: GReddy
Package 3: Stillen
Package 4: A'PEXi
Package 5: Turbonetics
Increases Acceleration Unlocked after completing Challenge #9. Price: 1,000
Brakes Package
Content
Brand Packages
Street Compound Brake Pads
Steel Braided Brake Lines
Cross Drilled Rotors
Package 1: AEM, Stillen, Brembo
Package 2: KVR Performance, NEUSPEED, Jackson Racing
Package 3: Arospeed, HP Racing, Wilwood Engineering
Increases Handling Unlocked after completing Challenge #38. Price: 2,000
Weight Reduction Package
Content
Brand Packages
Remove Rear Seats
Remove Interior Panels
Remove Spare Tire
Sparco
Increases Acceleration and Handling Unlocked after completing Challenge #14. Price: 750
Suspension Package
Content
Brand Packages
Sport Performance Springs and Shocks
Strut Tower Bar
Package 1: Arospeed, Eibach, HKS USA, Stillen
Package 2: NEUSPEED, Skunk2 Racing, Apex Springs, Bilstein
Package 3: H&R Springs, KONI, KYB America, HP Racing, A'PEXi
Increases Handling Unlocked after completing Challenge #14. Price: 750
Nitrous Oxide System Package
Content
Brand Packages
Dry Shot of Nitrous Oxide Package 1: Nitrous Express
Package 2: NOS
Increases Handling Unlocked after completing Challenge #14. Price: 750

Pro Performance Packages

Engine/Exhaust Package
Content
Brand Packages
Mild Camshaft & Cam Gears
High Performance Throttle Body
High Flow
Intake Manifold
Larger Diameter Flowpipe
Package 1: AEM, Jackson Racing, A'PEXi, GReddy, Venom
Package 2: Arospeed, NEUSPEED, Skunk2 Racing, Borla, Injen Technology
Package 3: DC Sports, HKS USA, HP Racing, Stillen
Package 4: Scorpion Exhausts, Henshin Auto, DC Sports
Increases Acceleration Unlocked after completing Challenge #30. Price: 1,000
Drivetrain Package
Content
Brand Packages
Limited Slip Differential
High Performance Clutch
Package 1: ACT, NEUSPEED, Arospeed
Package 2: Jackson Racing, Stillen, HKS USA
Package 3: HKS USA, NEUSPEED, Jackson Racing
Increases Top Speed Unlocked after completing Challenge #30. Price: 1,000
Tires Package
Content
Brand Packages
Pro Performance Tire Package Package 1: Toyo Tire
Package 2: Yokohama
Package 3:Kumho Tires
Increases Handling Unlocked after completing Challenge #30. Price: 1,000
ECU & Fuel System Package
Content
Brand Packages
High Flow Fuel Pump
Adjustable Fuel Pressure Regulator
Replace Fuel Rail
Replace Fuel Filter
Package 1: Venom, AEM, GReddy
Package 2: Stillen, Jackson Racing, Skunk2 Racing
Package 3: A'PEXi, Stillen, Venom
Increases Acceleration and Top Speed Unlocked after completing Challenge #38. Price: 2,000
Turbo Package
Content
Brand Packages
Stage 2 Turbo Kit w/ Intercooler Package 1: HKS USA
Package 2: GReddy
Package 3: Stillen
Package 4: A'PEXi
Package 5: Turbonetics
Increases Acceleration Unlocked after completing Challenge #38. Price: 2,000
Brakes Package
Content
Brand Packages
Large Cross Drilled Rotors
Race Compound Brake Pads
Package 1: AEM, NEUSPEED, Jackson Racing
Package 2: KVR Performance, Stillen, Wilwood Engineering
Package 3: Arospeed, Brembo, HP Racing
Increases Handling Unlocked after completing Challenge #38. Price: 2,000
Weight Reduction Package
Content
Brand Packages
Replace Rear and Side Windows with lightweight polycarbonate
Replace Front Seats with Lightweight Racing Seats
Sparco
Increases Acceleration and Handling Unlocked after completing Challenge #48. Price: 1,500
Suspension Package
Content
Brand Packages
Front and Rear Sway Bar
Front and Rear Tie Bar
Upgrade Bushings
Package 1: HKS USA, Stillen, Skunk2 Racing, KONI
Package 2: Arospeed, NEUSPEED, Apex Springs, HP Racing
Package 3: Eibach, Bilstein, H&R Springs, DC Sports, A'PEXi
Increases Handling Unlocked after completing Challenge #48. Price: 1,500
Nitrous Oxide System Package
Content
Brand Packages
Wet Shot of Nitrous Oxide Package 1: Nitrous Express
Package 2: NOS
Increases Handling Unlocked after completing Challenge #48. Price: 1,500

Extreme Performance Packages

Engine/Exhaust Package
Content
Brand Packages
Replace Piston & Rods
Racing Camshaft & Cam Gears
Port & Polish Heads
Blueprint the Block
Low Restriction, High Flow Headers Installed
Package 1: AEM, NEUSPEED, Jackson Racing, Venom, Arospeed
Package 2: Greddy, Skunk2 Racing, A'PEXi, Borla, HKS USA
Package 3: DC Sports, Injen Technology, HP Racing, Stillen
Increases Acceleration Unlocked after completing Challenge #66. Price: 2,000
Drivetrain Package
Content
Brand Packages
Six-speed transmission
Lightweight & Strengthen Driveshaft
Package 1: DC Sports, ACT, NEUSPEED
Package 2: Jackson Racing, Stillen, HKS USA
Package 3: NEUSPEED, ACT, DC Sports
Increases Top Speed Unlocked after completing Challenge #66. Price: 2,000
Tires Package
Content
Brand Packages
Extreme Performance Tire Package Package 1: Toyo Tire
Package 2: Yokohama
Package 3:Kumho Tires
Increases Handling Unlocked after completing Challenge #66. Price: 2,000
ECU & Fuel System Package
Content
Brand Packages
Stand Alone Engine Management Unit
Replace Fuel Injectors
Package 1: Jackson Racing, AEM, GReddy
Package 2: Stillen, A'PEXi, Venom
Package 3: Venom, Skunk2 Racing, Stillen
Increases Acceleration and Top Speed Unlocked after completing Challenge #80. Price: 4,000
Turbo Package
Content
Brand Packages
Stage 3 Turbo Kit Package 1: HKS USA
Package 2: GReddy
Package 3: Stillen
Package 4: A'PEXi
Package 5: Turbonetics
Increases Acceleration Unlocked after completing Challenge #80. Price: 4,000
Brakes Package
Content
Brand Packages
Large Cross Drilled and Slotted Rotors
Four-piston Racing Calipers
Package 1: AEM, KVR Performance, Arospeed
Package 2: NEUSPEED, Stillen, Wilwood Engineering
Package 3: Jackson Racing, Stillen, HP Racing
Increases Handling Unlocked after completing Challenge #80. Price: 4,000
Weight Reduction Package
Content
Brand Packages
Replace Doors and Trunk Lid with Lightweight materials
Cut and Foam Fill excess Frame and Interior components
Sparco
Increases Acceleration and Handling Unlocked after completing Challenge #91. Price: 3,000
Suspension Package
Content
Brand Packages
Coil Over Shock System with adjustable Pillow Mounts Package 1: Eibach, Stillen, Bilstein, KONI
Package 2: HKS USA, NEUSPEED, Skunk2 Racing, DC Sports
Package 3: Arospeed, Apex Springs, H&R Springs, A'PEXi, HP Racing
Increases Handling Unlocked after completing Challenge #91. Price: 3,000
Nitrous Oxide System Package
Content
Brand Packages
Direct Port of Nitrous Oxide Package 1: Nitrous Express
Package 2: NOS
Increases Handling Unlocked after completing Challenge #91. Price: 3,000

Unique Parts

Unique parts in Underground can be won upon completion of TJ's time trial events. They cannot be obtained elsewhere and allow vast improvements on performance.

Overall three unique parts can be won, with the first one being unlockable after completing event #7.

The player gets the chance to select between an Engine/Exhaust, Drivetrain and Tire package. All of these upgrades improve handling, except for the engine/exhaust package.

Yet another unique part can be won after completing event #27. The player may select a Brakes, Drivetrain or Tires package for handling. TJ offers a Turbo and ECU package for acceleration improvements.

The final unique part, which can be won in Underground Mode, can be unlocked in event #96. TJ will offer to the player following items; Brakes kit, Drivetrain, NOS, Suspension, Turbo and Weight Reduction package.

Notes

  • By installing an engine/exhaust package, the engine sound of a vehicle will be changed.

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