World Driver Championship
Outside link to all the information you'll need on this game, and more!
Courtesy of: Gamefaqs.com
ALL GT2 CIRCUIT CARS
Go to the Championship Mode screen and press:
Z, Right on the Control Pad, Z, Z, Z, B, bottom C, A, right on the
Control Pad, Start, B, then A
Note: You won't earn any experience points for using this code.