First, you should know that downloading OSx86 is totally illegal. Period. Even if you owned your own copy and downloaded it via bittorrent, you’re still sharing it with people who don’t.
Secondly, it’s immoral. Apple has spent thousands of man-hours working on OS X and you’re getting it for nothing. You’re not helping Apple along and you’re not helping yourself in the long run.
Most people download OS x86 via bittorrent and usually find it on the Pirate Bay or Demonoid. These are not the only two sites but they are the ones most talked about.
I tell you this not because this site supports pirating (we don’t) and doesn’t support search engines (we do)