Win the following races to unlock the corresponding car or part:

Saleen Qualification: Hummer H2
Colossus: Nissan 350Z
Urban Sports Cars: Audi TT
Nissan competition: None
V6 Engine: Sport Tuning Kit Evo 1
Urban Performance Cars: 2005 Corvette C6
Low Displacement Challenge: None
Chapman tribute: None
Chevrolet Fighting: Sport Tuning Kit Evo 2
Aero 8 Trophy: None
Mythical Elanor: Morgan Aero 8
Barchetta Challenge: None
Under 500 hp: Performance Tuning Kit Evo 1
GT Championship: Nissan Skyline GT-R R34
Aston Challenge: None
German Power: None
TVR Challange: None
Gentlemen Drivers: Performance Tuning Kit Evo 2
Sport Racing Cars: Lamborghini Gallardo
V8 Fever: Unknown
V10 Rage: Evo Kit 1
Propulsion Challenge: Unknown
Performance Racing Cars: Unknown
V12 Only: Unknown
American Muscles: Unknown
4x4 Competition: Unknown
Carol Shelby Challenge: Unknown
Ultra Race Cars: Lamborghini Murcielago
Professional Challenge: Unknown
Italian Affair: Unknown