Successfully complete Garage Life mode to unlock the Auto Modellista Shop option at the Garage Life screen, and the Credits option under the options menu.
Finish the FINAL level (seven races without the mountain passes). There is a Strict Remote Controlled car challenge. You must remember that your cars won't be as fast as they would on an ordinary track. The speed is in MHz.
Go on any course with a car you can put a turbo in (best with an Evo). Get up to top speed or just drive very fast. Suddenly release the gas or hit the brakes. You will hear the turbo letting air out. Then, an explosion will come out of the muffler. This is a nice effect for editing replays.
enter triangle, up, right, down, L1, L2 and when you type in the code all your cars saved in your garage should have 700 ps. if they don't you have entered the cheat wrong and you smoke balls. oh yeh and if you use cheats you are a arse licker.