As far as know there are two. the front drivers side can be changed if you cut off the nipple(this also identifies the banjo's with a filter) and use a trimmed wrench, better to do this one when your taking heads off, it's behind the drivers side intake cam gear and rear cover, feeds the OCV. The other is Pass side aft, turbo removal. Use Search link on top of forum. Here's a link for you, more out there.