Unlock Alternate Cars: Press L1 or R1 at the 'Car Selection' screen when selecting Ryo, Retsuya, Retsu, Go, J, Mikhail, Tokuichi, Rion, Huan, Nieminen or Juliana.
Unlock Phantom-Blade Car: Using Knuckle Breake complete Story mode and then defeat the Phantom-Blade car in the following challenge to unlock it.
Unlock Vise Intruder Car: Using Max Breaker complete Story mode and then defeat the Vise Intruder car in the following challenge to Unlock it.
Unlock Ray Stinger Car: Using Fire Stinger complete Story mode and the then when the ending sequence has completed restart the game and select the option under 'Continue' to begin a Ray Stinger versus Fire Stinger challenge. Defeat the Ray Stinger to unlock it.