It is working with the Japanese version, at least. It has English + a couple of other languages. Saw it on a few private trackers as well.
Below are some additional background details on the Sonic Adventure 2 video game for those interested:
Sonic Adventure 2 is a platform video game developed by Sonic Team and initially published by Sega for the Dreamcast console, followed by a Nintendo GameCube port and high-definition versions for Microsoft's XBox Live Arcade and Sony's PlayStation Network.
Sonic Adventure 2 uses 3D graphics in addition to scrolling backgrounds. The game follows the same basic principles of previous games in the series. Within most stages are rings, which will protect the player from dying, so long as at least one is held by the player.
The Tails and Doctor Eggman stages are an exception, as they employ a health bar which is reloaded by gathering rings. Item capsules are also located within the stages, which provide the player bonuses.
Each character has obtainable power-ups which grant them new abilities, such as the ability to destroy metal boxes or play mystical melodies.
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Finally after a very long search, i found the DLC for GranTurismo 5 - BCUS98114. Inside you will find the pkg with rap files needed for activation. Important guys, for this to work you will need reactpsn 2.26 to activate the DLC. I have tested the dlc and it works. The cars will be in the dealership offers. Don't make like me to look for it almost a hour , before i realize where to look )
The link is: http://uploaded.net/file/vkpg7it7
Extract the rar archive and there they are. Enjoy the ride. PSN games down loader and DLC, RAP files finder and downloader. Guys i can't remember when this was posted but i will post it again, a very big help for this tool in finding the DLC you want and get it, along with the files needed for activation .
Credits go to the original creator, here you go the link: http://ul.to/cuuk04vg
This tool give me the DLC i was looking for. Thanks to all who made this project go out for the public.