Flying in New Jersey
When you go to New Jersey and you go to the part where there is a hill, go right to the top of the hill and come zooming down and hit the wall. What you will find is yourself flying. It may work or not sometimes.
Basic Game hints
Hint 1: Make sure to play-through the Story-mode before you tackle Career mode, so that you have all the best vehicles to start with.
Hint 2: By Tapping L and R buttons will allow you to shift your car left/right, performing powerful slides that will crash other cars off the road.