Enter the cheat to make your car jump in the air when you press L3, and the cheat to get high acceleration and no top speed. Then, drive through the power plant until you get to the bit where you have to jump across the gap, through the fan and out the other side - but don't go through the fan! instead, drop to the floor below the fan and keep turning around until you can see the hole in the wall which you can use to get into Mr. Burns back yard (You will recognise it when you see the giant chessboard). Usually, you have to go in there by foot. But now you can use the jump (with L3) to get in there - with your car! Now, drive as far as you can up the stairs until you are forced to jump because of a brick wall. Now jump. It may take a few tries to succesfuly break in, but it is possible. You will notice (If you have managed to break in), that if you enter Mr.Burns room, there are large metal pits in various parts of the wall. Good luck trying to break in! P.S: At one point when I broke in, I managed to get my car half-stuck in the wall, so be careful.