How to install:
1. Open ppf-o-matic3.exe
2. Choose game's ISO ([B]should be a Japanese version's ISO; this mod won't work with other versions of the game[/B])
3. Choose mod.ppf as a patch
4. Install the patch
5. Enjoy the modded game

Mod's thread: http://www.gtrcars.net/forum/showthread.php?p=48787