Need for Speed Underground Rivals - Helpful Momentum

Bonus Parts:
Complete the last race of a set with a gold medal.

Boss Cars:
In some race events that says Boss Race in the event description, you can win that Boss's car by beating the event on Gold difficulty. When you win a Boss car, it appears in the Pocket Garage and you can race it in any game event.

More Boss Cars:
To win a free WRX sti or 1969 Doge Charger, beat the gold medal ranking of the PRO boss battles.

Boss car warning:
When you are considering buying a car, do not purchase any of the cars that are used as Boss cars. If you buy one you will end up having two of the same car. Your garage can only hold 20 cars, and there are 24 cars total. The four Boss cars have their own separate garage and do not take up any of the twenty slots. You cannot get 100 completion if you buy any of the cars used as Boss cars.

To win a free Corvette of Skyline R34 GTR, beat the gold medal ranking of the MASTER boss battles.

Car List
The following cars are unlocked for purchase:

Volkswagen Golf GTI 2.0L: 22,000
Ford Focus ZX3: 18,000
Mazda Miata MX-5: 19,000
Dodge Neon: 17,000
Nissan Sentra SE-R SPEC-V: 21,000
Toyota Celica GT-S: 23,000
Nissan 240SX: 30,000
Mitsubishi Eclipse GSX: 32,000
Mazda RX-7: 34,000
Mazda RX-8: 48,000
Pontiac GTO: 46,000
Subaru WRX STi: 46,000
1969 Dodge Charger: 44,000
Toyota Supra: 52,000
Nissan 350Z: 54,000
Mitsubishi Lancer: 51,000
Ford SVT Mustang Cobra R: 56,000
1967 Ford Mustang: 65,000
Nissan Skyline R34 GTR: 70,000
Chevrolet Corvette Z06: 72,000

Earning driver points:
You can earn all the upgrade points in an event by winning it in Bronze and Silver difficulty settings. However, to get all of the driver points you must win all of the races under the Gold difficulty setting. Check the "Driver Status" screen in "My Underground" to see your current driver points and driver rank. Maxing out your driver rank will unlock secret bonuses.

Infanite nozboost:
At selection screen press Down, Circle, Circle, Up, Square, Circle

More parts for your vehicle:
On any race set, complete the last race in that event with a gold medal and you will unlock bonus parts for your vehicle.

Nitrous Glitch:
In drag racing if you tap the nitrous button instead of holding the button down your car will accelerate at a faster speed

Computers and Shortcuts:
In Lincoln Connector an easy way to win is to simply force the computer into the first shortcut of the race. Once the computer is in the shortcut the car will freeze for a period of time. This freezing can even last for up to a lap.

Fast Mazda RX-7:
After getting the RX-7, put the following upgrade parts on the car to obtain maximum speed: Aeromax spoiler, Beast Carbon Fiber hood, Gills roof scoop, and Max 1 body kit. Also, make sure you all of the performance upgrades unlocked and ready to install. You can get over 210 mph with this setup and win won a race by 42 seconds.

Avoid losing control:
Press R1 before you hit a wall or you might lose control