From GTPlanet Game Guides

This is the final car list for the Japanese edition of Gran Turismo 5: Prologue, prior to installing the Spec II update. This list is only accurate if you have a non-updated Japanese version of the game. If you have a game from any other region or have updated your game this list is the one you require.

Acura

NSX '91

Alfa Romeo

147 TI 2.0 Twin Spark '06
Brera 3.2 JTS Q4 '06

Audi

R8 4.2 FSI R tronic '07
TT 3.2 Quattro '07

BMW

135i Coupe '07
Z4 3.0i '03 M3 Coupe '08

Chevrolet

Corvette Z06 (C6) '07

Daihatsu

Copen Active Top '02
OFC-1 '07

Dodge

Viper GTS '02

Ferrari

F430 '06
599 '07

Ford

Mustang V8 GT Coupe Premium '07

Honda

Integra TYPE R (DC5)

Lancia

Delta HF Integrale Evoluzione '91

Lexus

IS-F '07

Lotus

Elise Sport 190 '96
Elise 111R

Mazda

Atenza Sport (2007 Tokyo Motor Show reference exhibit)

Mercedes-Benz

SL55 AMG (R230) '02

Mitsubishi

Lancer Evolution IX GSR '05
Lancer Evolution X GSR Premium '07

Nissan

GT-R (R35)
GT-R Proto
Fairlady Z Version S (Z33)
Skyline Coupe Concept
Skyline Coupe 370GT Type SP (V36)
Skyline GT-R Vspec II Nur (R34)
Skyline Sedan 350GT Type SP (V36)

Renault

Clio Renault Sport V6 '00

Subaru

Impreza WRX STi '07

Suzuki

Swift Sport '07
Cappuccino (EA21R)

TVR

Tuscan Speed 6 '00

Volkswagen

Golf IV GTI '01