To get to the secret quarry area, starting at the top part of the dam, head west and take W. Lake Drive northwest, and turn left. You will see an opening with a road that leads down and can be used to perform barrel rolls.
In any Road Rage event, wait for the timer to run out while on the roof of a parking garage. You will end up on the wall of the garage. Note: To exit, you must gas and steer at the same time while boosting.
At the main menu or while the game is paused, select "Under The Hood"> "Sponsor Code". Activate the following cheats by entering the corresponding case sensitive codes. The cars will appear in thejunkyard after earning the required license. Sponsor codes do not workfor the v1.6 and higher patches:
B'Z Friction Ikusa GT (Japanese version)
Circuit City Hotrod
Enter "circuitcity" and get the burnout paradise license.
Hunter Best Buy Oval Champ car
Enter "bestbuy" and get the A license.
Kitano GameStop Sport car
Enter "gamestop" and get the A license.
Kitano Micromania Hydros Custom car (French version)
Enter "H211 1Z99 LZ00 00BB"(those are zeros) and get the A license.
Steel Wheels car
Enter "U84D 3Y8K FY8Y 58N6", "E60J 8Z7T MS8L 51U6","G23X 5K8Q GX2V 04B1", or "E165 6L1Q ZQ2H 10V3", and get the "BurnoutParadise" license.
Steel Wheels car (European/Autralian version)
Enter "Z891 4K88 IN2579AA" or "B179 8M20 XA09 80FF" in the European or Australian version ofthe game, and get the burnout paradise license.
Steel Wheels car (U.K. version)
Enter "B179 8M20 XA09 80FF"
Wal-Mart F1 racer
Enter "walmart" and get the burnout paradise license.
Go on top of the Exhibit Hall building next to the Wildcats Stadium. Go to the edge of the roof in the direction your car is facing. Move your car close to the edge without falling off. Your car should shake a moment, then go through the building. Your car will be in half. You can go out but cannot go back in on the ground.