Midnight Club: Street Racing Cheats

Look for red dots that appear on various levels. Place your car on the dot until a click sound is heard to unlock a new car. Some of the dots can be found at the following locations:

If you look in the map you will see a section near where you start. It has a bunch of streets.
There will be a building with around 7 pillars.
Behind the pillars is breakable glass. go through it and you will see a purplish light. Stay in the light until an unlocking sound.
Exit and go where you pick your car. There will be a KARUMA.

In order to geed the Nitrous boosts, you have to get the third level of a car. Once you have the third level car, for instance the Last Truck, go into a race. Then, click the horn button. You should hear a WHOOSH. (You get a limited supply, so use it wisely; around 5) This really will help you break those neck-and-neck races on the straightaways

Go to the Arcade Mode and enter the Head to Head race for New York or London. Beat all the races to unlock the cars. Beat New York get New York Cop Cars, same for London.