Need for Speed Underground 2 [NDS]

Quick boost:
If you crash your car in a race and you a manual transmission, put in neutral. Hit the gas all the way, then slam it into first gear to get a very quick boost.

Easy wins:
The key to victory in any course or mode is to have a flawless race. Avoid traffic, cut corners, and drive straight at every opportunity. A tip is to check where you will be racing next and set up a custom free-race to emulate the race course. Here you can check the feel of the course and find valuable shortcuts.

Easy cars:
Do only the drag races until you complete it. You should now have at least an RX-8. The rest of the game should be very easy.

Unlock Brakes Bonus
Beat 7500 points in Pressure Tunning 2.

Unlock Chassis Bonus
Beat 5000 points in Pressure Tunning 1.

Unlock Controls Bonus
Beat 5000 points in Engine Tuning 3.

Unlock Drivetrain Bonus
Beat 50 points in Dyno Run 1.

Unlock Engine Bonus
Beat 100 points in Nitrous Tuning 1.

Unlock Exhaust Bonus
Beat 2000 points in Engine Tuning 1.

Unlock Nitrous Bonus
Beat 175 points in Nitrous Tuning 3.

Unlock Suspension Bonus
Beat 100 points in Dyno Run 2.

Unlock Turbo Bonus
Beat 150 points in Nitrous Tuning 2.

Unlock Wheels Bonus
Beat 4000 points in Engine Tuning 2.