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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Vegas Pack: Bring a taste of Vegas to Empire Bay as you cruise through the town in two new cars with smooth handling and timeless lines. Vito shows his Vegas style in two new suits.
War Hero Pack: The ‘40s wouldn’t be complete without a war hero. Vito plays the role well in the War Hero add-on pack. Drive two military style vehicles and notice the superior handling in all weather conditions. Vito looks sharp in two new military outfits including fatigues and a dress uniform.
Renegade Pack: Show off your inner renegade in this new add-on pack. Start with two new cars, one with the slick styling and tight handling of a small sports coupe and the other with the revved up engine of a ‘50s hot rod. Outfit Vito in two new suits including leather and lettermen’s jackets to fit his renegade persona.
Greaser Pack: The Mafia II Greaser downloadable pack is all about speed. These two new hot-rod speedsters will win you pink slips every time. Pair that with two new suits for Vito, one with leather jacket and heavy boots, the other a leather racing suit, and get ready to start your engine.
just extract to the USRDIR of your mafia 2 game. i got this from the russian special edition but works on EUR version of mafia 2 (BLES00521) may work for US version. other dlc missions were only in russian so i thought it useless to post.
if you don't have psn access then it won't work, but there are a way to make it work without psn.
tested on BLES00521 on 3.55 kmeaw fw using multiman 2.0+
backup your param.sfo and eboot.bin before copying over the files
after you backup and copy PARAM.SFO and EBOOT.BIN
install the 1.04 update PKG if you wish to have an updated games
this was taken from the russian special edition floating around but if you use the eboot.bin and param.sfo you can use english. sorry but the DLC missions won't work... only in russian...