I'm not planning on doing this myself, but I'm just curious. Like, if you download the DLC from a torrent website, then put the DLC onto a flash drive, and put it onto your PS3, will it load up and work?
No , you can't get anything like that anywhere other than the playstation store
ps3 games are not available on torrent either , and dlc ? that is only digital content locked to the psn account holder who bought it so how would you get past that if you stole pirated content ? ( Yes it's theft if you download via torrent , no different than walking into wal-mart and stealing a game so how is it people think it's somehow not as bad a crime and OK ? )
you can't even run game software from a flash drive or copy it to a ps3 , so again how would you get digital content not owned by the account licensed to another user from psn to a torrent to another ps3 and install it ?