Need for Speed: ProStreet Cheats
Try to unlock the last 4 tracks.
If you unlock the last 4 tracks you are able to chose 4 proper race cars 1 Muscle 1 Sports 1 Super and 1 Turner.
When there is a right corner, drive to the left corner first before making the turn. The same goes for left corner, drive to the right. This way you won't need to slow down as much and you'll maintain your momentum through the turn.