Need for Speed Underground features the following aftermarket manufacturers to tune your car:
(Thanks to aXi for submitting the links)

5zigen Performance Products
ABS Dynamic Car Design
AEM Performance Products
Act Performance Products
Alpine Car Audio
Apex Integration Performance Products
Apex Springs Fahrwerktechnik
Arospeed Car Design
Audiobahn Car Audio
BBS Car Wheels
Bilstein Fahrwerktechnik
Borla Performance Products
Brembo High Performance Disk Brakes
Clutch Masters Performance Products
DC Sports Performance Products
Eibach Springs Fahrwerktechnik
Enkei Car Wheels
Eurolite Car Lightning Systems
Extreme Dimensions Car Design
Greddy Performance Products
H&R Springs Fahrwerktechnik
HKS USA Performance Products
HP Racing Performance Products
Henshin Auto Car Design
Injen Performance Products
JSP America Car Design
Jackson Racing Performance Products
KVR Performance High Performance Disk Brakes
KYB America Fahrwerktechnik
Kenwood Car Audio
Koni Fahrwerktechnik
Kumho Tires Reifen
König Car Wheels
Momo Car Wheels
Neuspeed Performance Products
Nitrous Express Nitrous Oxide Systems
Nos Nitrous Oxide Systems
O.Z. Car Wheels
PIAA Car Lightning Systems
Plasmaglow Neon and LED Auto Accessories
Racing Hart Concepts Car Wheels
Scorpion Exhausts Performance Products
Skunk2 Racing Performance Products
Sparco Car Design
Stillen Performance Products
Streetglow Neon and LED Auto Accessories
Toyo Tires Reifen
Turbonetics Performance Products
Venom Performance Products
Wilwood High Performance Disk Brakes
Wolfrace Wheels Car Wheels
Yokohama Reifen

More Tuning Links:

- Import Tuner
- TurboMagazine
- Sport Compact Car
- Hot4s

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