Cars from Need For Speed Underground: Finish every one of the Crash Mode levels with a "Gold" rank. Then, hold L2 + R2 when picking a car at the vehicle selection screen. User Cheat by JamesC

How to unlock cars: Choose your favorite track in world tour mode and race it repeatedly (do not retry). Upon continuation repeat again. User Cheat by JamesC

Change song:
Hold L2 + R2 while playing the game to advance to the next song.

Compact Types 1, 2, and 3:
Available from the start of the compact race series.

Muscle Types 1, 2, and 3:
By winning a Gold Medal in the Silver Lake Compact Grand Prix.

Coupe Types 1, 2, and 3:
By winning a Gold Medal in the Waterfront Muscle Grand Prix.

Sports Types 1, 2, and 3:
By winning a Gold Medal in the Vineyard Coupe Grand Prix.

Super Types 1, 2, and 3:
Available from the start of the super race series.

Assassin Compact car:
By getting 15 Takedowns.

Assassin Muscle car:
By getting 30 Takedowns.

Assassin Coupe car:
By getting 60 Takedowns.

Assassin Sports car:
By getting 100 Takedowns.

Assassin Super car:
By getting 150 Takedowns.

Classic Hotrod:
By getting a "Gold Medal" rank in all special events.

Custom Compact Car:
By getting 10,000 Burnout points in world tour mode.

Custom Coupe Car:
By getting 50,000 Burnout points in world tour mode.

Custom Muscle Car:
By getting 25,000 Burnout points in world tour mode.

Custom Sports Car:
By getting 100,000 Burnout points in world tour mode.

Custom Super Car:
By getting 200,000 Burnout points in world tour mode.

Compact DX Car:
By getting 4 Gold Medals in world tour mode.

Muscle DX Car:
By getting 10 Gold Medals in world tour mode.

Coupe DX Car:
By getting 18 gold medals in world tour mode.

Sports DX Car:
By getting 25 Gold Medals in world tour mode.

Super DX Car:
By getting 32 Gold Medals in world tour mode.

Tuned Compact:
By winning a Gold Medal in Downtown Race 1.

Tuned Coupe:
By winning a Gold Medal in the Vineyard Face-Off.

Tuned Muscle:
By winning a Gold Medal in the Kings Of The Road Race.

Tuned Sports:
By winning a Gold Medal in the Continental Run Race 2.

Tuned Super:
By winning a Gold Medal in the Island Paradise Face-Off.

Modified Compact:
By winning a Gold Medal in the Waterfront Face-Off.

Modified Muscle:
By winning a Gold Medal in the Mountain Parkway Face-Off 1.

Modified Coupe:
By winning a Gold Medal in the Alpine Race.

Modified Sports:
By winning a Gold Medal in the Continental Run Face-Off 2.

Modified Super:
By winning a Gold Medal in the Golden City Face-Off.

Compact Prototype:
By winning a Gold Medal in the Lakeside By gettingaway Face-Off 1.

Muscle Prototype:
By winning a Gold Medal in the Mountain Parkway Face-Off 2.

Coupe Prototype:
By winning a Gold Medal in the Continental Run Face-Off 1.

Sports Prototype:
By winning a Gold Medal in the Frozen Peak Face-Off 2.

Super Prototype:
By winning a Gold Medal in the Gold Medal GP.

Dominator Compact:
By winning a Gold Medal in the Kings Of The Road Face-Off.

Dominator Muscle:
By winning a Gold Medal in the Lakeside By gettingaway Face-Off 2.

Dominator Coupe:
By winning a Gold Medal in the Frozen Peak Face-Off 1.

Dominator Sports:
By winning a Gold Medal in the Alpine Face-Off.

Dominator Super:
By winning a Gold Medal in the Dockside Face-Off.

Heavy Pickup:
By getting $1 million in world tour mode.

4WD Racer:
By getting $2 million in world tour mode.

SUV Deluxe:
By getting $5 million in world tour mode.

4WD Heavy Duty:
By getting $10 million in world tour mode.

B-Team Van:
By getting $15 million in world tour mode.

INT Express Delivery Truck:
By getting $20 million in world tour mode.

Tractor Cab:
By getting $30 million in world tour mode.

Longnose Cab:
By getting $50 million in world tour mode.

City Bus:
By getting $70 million in world tour mode.

Trash Truck:
By getting $90 million in world tour mode.

Fire Truck:
By unlocking all crash headlines in world tour mode.

Oval Racer Special:
By unlocking all signature takedowns.

Custom Coupe Ultimate:
By winning a Gold Medal in all crash events.

Euro-Circuit Racer:
By unlocking all takedown trophies.

Classic Hotrod:
By unlocking all special event postcards.

U.S. Circuit Racer:
By winning a Gold Medal in Super GP.

World Circuit Racer:
By winning a Gold Medal in all race events.