Drift Physics for All Cars
On the main menu, press: R, UP, UP, UP, DOWN, DOWN, DOWN, L

Unlock All Circuit Tracks
On the main menu screen, press: DOWN, R, R, R, X, X, X, Z

Unlock All Sprint Tracks
On the main menu, press: Up, X, X, X, R, DOWN, DOWN, DOWN

Points for 360 in Drift
When you are in drift mode you can get some extra points for doing doughnuts. Hold one direction and the handbrake and gas and let go of the handbrake after a second. You'll just sit there and do doughnuts. This won't get you massive points but it's something