All Circuit tracks:
Down, R1, R1, R1, R2, R2, R2, Square.

All Drag tracks:
Left, Square, Right, R1, Square, L1, L2, R2.

All Drift tracks:
Right,, Right, Right, Right, Left, R2, R1, L2.

All Sprint tracks:
Up, R2, R2, R2, R, Down, Down, Down.

Drift physics for all cars:
R1, Up, Up, Up, Down, Down, Down, L1.

Acura Integra:
R2, R2, R1, R2, L2, L1, Down, Up.

Acura RSX:
R1, R2, Down, Left, Up, Right, Left, Right.

Ford Focus:
Left, Right, Up, R1, R2, R1, R2, Up.

Honda S2000:
Up, Up, Down, Down, Up, Left, Square, R2.

Hyundai Tiburon:
Left, Right, Left, Right, Up, Down, Up, Down.

Level 1 Performance Parts:
R2, R2, R1, R1, Left, Right, Left, Right.

Level 2 Performance Parts:
R1, R1, R1, R1, R2, R2, Left, Right.

Level 2 Visual Parts:
Down, Left, Up, Down, R1, R2, R2, Square.

Lost Prophets Car:
Up, Up, Up, Right, Down, Down, Up, Right.

Mitsubishi Lancer:
Left, Left, Left, R1, R1, R2, R2, L2.

Mystikal Car:
Up, Right, Up, Up, Down, Right, Up, Right.

Nismo Car:
Up, Down, Up, Left, Down, Down, Up, Right.

Nissan 240SX:
Up, Down, Left, Right, Square, R1, L2, R1.

Nissan 350Z:
Right, Right, Down, Up, Square, L1, R1, L2.

Nissan Sentra:
Right, Right, Right, L2, L2, R2, R2, Up.

Nissan Skyline:
Down, Down, L1, L2, L1, L2, L1, Down.

Petey Pablo Car:
Up, Up, Up, Up, Down, Up, Up, Right.

Rob Zombie Car:
Up, Left, Up, Up, Down, Left, Up, Right.

Subaru Impreza:
Up, Down, Down, Up, L2, Up, L2, Down.

Toyota Supra:
R1, R1, R2, R1, R2, R1, L2, L1.

1988 Nissan Skyline GTR34
Select Underground mode and complete at least the first 80 missions. A recommended car to use is the Acura RSX. You will then challenge Samantha. Defeat her on the medium difficulty setting and win the next drag race to unlock the 1998 Nissan Skyline GTR34.

Eddie's Nissan Skyline
Keep winning style points to unlock Eddie's car in the end. Note: It is faster to win them in drift. When your style meter maxes out, a message stating that you have won Eddie's Nissan Skyline will appear.

Kurt's Killer Ride
Use a Stock Mazda RX-7 and keep trying until you win.

Samantha's car
Keep getting style points until you get all the vinyls, then fill up the next meter.

Faster speed
Hold R2 for greater speed. Note: This does not work in drags.

Easy wins
If you are having trouble winning circuit, sprint, or lap knockout races, take off all of your engine performance mods. Note: This works for every car, is...