T-Dawg

Ok I found an action replay code for PS2 to unlock all cars in the NFSC. These are the cars.

Custom:
-Zonda F (2; they both appear to be stock)
-Lexus IS300 (1 stock, 1 tuned)
-Toyota Corolla GT-S (1 stock, 1 tuned)
-Toyota MR2 (1 stock, 1 tuned)
-Pontiac GTO (1 stock, 1 tuned)
-Lotus Europa S (1 stock, 1 tuned)
-Plymouth Roadrunner (1 stock, 1 tuned)
-'07 Shelby GT500 (2 stock)
-Porsche 911 GT3 RS (2 stock)

Bonus:
-Mazda RX-8
-Palmont PD2 (Interceptor Vette)

Stock:
-classic Dodge Challenger
-Infiniti G35
-Porsche 911 Turbo
I was wondering if you can customize the Cobra, GTO, etc...? Has anyone done it.
If you can customize how? Because the custom catergory cars cant be customized.