Midnight Club: L.A. Remix

Cheat mode

At the main menu, select "Options". Then, choose the "Cheat Codes" option, and enter one of the following codes to activate the corresponding cheat function:
All cars

Enter "sweetrides" as a code to unlock all cars.
All prize cars

Enter "coolrides" as a code to unlock all prize cars.
Extra money

Enter "gotcash" as a code.
Bonus cars

Successfully complete the indicated task to unlock the corresponding car:
Audi R8 (2008 ): Become the Los Angeles City Champion.
BOSS 302 (1969): Defeat Junichi in the "Pumping Iron" series race.
Chevrolet Camaro RS SS (1969): Win the "Bird On The Line" series race.
Ford Cobra Concept (2004): Win the "10 Carat Beatdown" series race.
Ford SVT Focus (2004): Win the "Cool Breeze" series race.
L.A. Police Car: Get a 100% completion in Los Angeles.
Lamborghini Miura SV (1971): Win the "Yamagata Duel" series race.
Lamborghini Murcielago Roadster "Dub Edition" (2006): Win the "Toshi Challenge".
Mitsubishi Lancer Evolution IX (2006): Win the "Beach Overlook" series race.
Pontiac Solstice (2006): Win the Tokyo Five Race Ginza Tournament.
Tokyo Police Car: Get a 100% completion in Tokyo.

Sell your cars without actually selling them

Your car has a trade-in value at the "Manage Vehicles" screen under the stat bars. You can receive that amount without losing your car. First, make sure you have enough money to buy the same car from the Showroom. For example, assume you have a 1979 Trans Am worth $36,000. Buy another one for $16,000. When you sell the car you just bought (the unmodified, stock, car), you will receive $36,000 and not lose your modified one (a $20,000 gain). There is a catch, however; your car will lose its value and only be worth approximately $12,000. However, for every race you finish and receive prize money, the value starts going back up. You can repeat the trick after awhile. This works with every car.
Put stock vinyls on other cars

Use the following trick to put the Trans Am Hood Bird on another car or the old school Challenger's decals on the new one. Go to the Vinyl shop, and save that car's Vinyl Package. There are three slots to save in. Then, apply it to the other car via the "Vinyl Packages" option (they will be at the bottom).