Hint: Easy drift points:

Some of the downhill drift races have houses with looping drive ways that you can drive in. Drifting in these driveways gets a lot more points than on the street because you are so far off the road and are not hitting a wall.

Go into Quick Race mode and select the Subaru Impreza with all Extreme or Level 3 performance parts. You may style the visual as desired, Then, choose Drift Track 6 and 10 laps with easy opponents. Drive through the middle of the track. When you are just before a corner, press the handbrake. Release it after you have slightly slid. Your car will soon almost spin and will drift through easily. Continue through the rest of the track by swerving on the straights and using the handbrake properly on the corners. You can get about 50,000 to 500,000 drift points at the end of the race.