M25 Racer

Go in the game folder and make a backup of the text file STATIC, then make these changes in it:
Radarbonus: 100 to as much as you desire
If you have problems in winning and aren't able to unlock too many cars the change POINTS (like giving last place 100 points outta 10 and then coming last! It's true) Now lose and you'll unlock all tracks and cars.