This is likely why you are looking for . ProStreet on the PSP is a grind. To unlock the best cars (like the Nissan GT-R or the Audi R8) and max them out with upgrades, you have to replay events repeatedly to earn enough cash.
Click the button below to download the save data file. The file is virus-free and tested working on the USA region version of the game. Nfs Pro Street Psp Save Data
If you already have a save, this will replace your progress. Be sure to back up your original folder to your PC first. Troubleshooting Corrupt Data This is likely why you are looking for