These become available when you defeat one of the following opponents and own their car; Baron, Bull, Earl, Izzy, Jade, JV, Kaze, Ming, Ronnie, Sonny, Taz, Vic, Webster.

Win the following Bonus Part Challenges to unlock the Super Composite hood and spoiler for the corresponding car.

Carrera GT:
Bonus Part Challenge 1 and 2 on Rank 2

Ford GT:
Bonus Part Challenge 1 and 2 on Rank 3

Gallardo:
Bonus Part Challenge 1 and 2 on Rank 4

Carrera 4S:
Bonus Part Challenge 1 and 2 on Rank 5

Corvette:
Bonus Part Challenge 1 and 2 on Rank 6

TT:
Bonus Part Challenge 1 and 2 on Rank 7

WRX STi:
Bonus Part Challenge 1 and 2 on Rank 8

Lancer:
Bonus Part Challenge 1 and 2 on Rank 9

Mustang GT:
Bonus Part Challenge 1 and 2 on Rank 10

Eclipse:
Bonus Part Challenge 1 and 2 on Rank 11

RX-8:
Bonus Part Challenge 1 and 2 on Rank 12

Cobalt SS:
Bonus Part Challenge 1 and 2 on Rank 13

Mazda3:
Bonus Part Challenge 1 and 2 on Rank 14

Golf:
Bonus Part Challenge 1 and 2 on Rank 15

The following cars become available options when you beat the indicated racer.

Unlock Carrera 4S:
Beat Ming

Unlock Carrera GT:
Beat Toru Sato

Unlock Corvette:
Beat Kamikaze

Unlock Eclipse:
Beat Big Lou

Unlock Ford GT:
Beat JV

Unlock Gallardo:
Beat Webster

Unlock Lancer and WRX STi:
Beat Earl

Unlock M3 GTR 1:
Beat Ronnie

Unlock M3 GTR 2:
Beat Razor

Unlock Mustang GT:
Beat Baron

Unlock RX-8:
Beat Izzy

Unlock TT:
Beat Jewels

Whenever you drive over 200 mph the nitrous will refill twice as fast.

Unlock ALL Bonuses and Get $500,000
Enter '!mr. Blonde' (include the space) without the quotes as a Profile name. You will still need to purchase the unlocked items.

Unlock ALL Tracks, Cop Cars in Tuner Takedown Mode and $100,000:
Enter '!get-set' without the quotes as a Profile name.

Unlock ALL Performance and Visual Upgrades and $200,000:
Enter '!tuner-well' without the quotesw as a Profile name.

Unlock ALL Cop Cars in Quick Race Mode:
Enter '!bacon' without the quotes as a Profile name.

Get $100,000:
Enter '!bacon' as a profile name.

Put all Cop cars in Tuner Takedown Mode:
Enter the code '!get-set' as a profile name.