Successfully complete the game with all 51 Gold trophies to unlock all cheats and special cars. You will also unlock a final Head-to-Head race with Ravenwest consisting of three laps around Circuit de la Sarthe that must be done on the Extreme difficulty. The race is worth $20 million and also awards you bonus cars, allowing you to have a total of 47 cars in your garage.
I need a xbox save 4 GRID 100% complete because I want to enable cheats in the OPTIONS/BONUSCODES menu. If anyone finished the game let me know. Upload your savegame with Xploder. You can only activate cheats if you finished the game.