Professional mode:
 
Select arcade mode, then highlight the "Hard" 
selection on the difficulty selection screen.
Hold L1 + R1 until it changes to "Professional". 

Mazda Roadster RS:
 
Successfully complete the Spider and Roadster 
cups with gold medals in all races to unlock 
the Mazda Roadster RS. 


Nissan Silvia K's 1800cc: 

Win the Beginner FR Challenge series to unlock
the Nissan Silvia K's 1800cc. 


Silver Honda CRX Del Sol SiR:
 
Win the Beginner Race of NA Sports series to 
unlock Silver Honda CRX Del Sol SiR.


Toyota Sprinter Truendo GT-Apex:
 
Successfully complete the Sunday Cup with gold
medals in all three races to unlock the Toyota
Sprinter Truendo GT-Apex. 


Mazda Eunos Roadster:
 
Successfully complete the Cupman Cup with gold
medals in all three races to unlock the Mazda 
Eunos Roadster.

by unknown


To get the Corvette C5R without spending lots 
of money, simply win the 150 miles Super Speedway.
It is one of the 4 cars winnable in that race.

Beat the Endurance Race, Super Speedway 150 miles
to get one of 4 cars. The best one is F090 F1 Car.
Beat it over and get all the others. This probably
works for all other Endurance Races too.

Submitted by curt_gaud at mailextreme.com