I don't think the 3rd hole is neccessary with the following reasons.unknown1x said:so.... just wonder... derx, the oct shoul dhave 2 holes or 3 holes now? i am seriously wondering.. sinc.e. most diy oct seems to have 1 extra breather other then the 2 intake and output hole from pcv to manifold? such as the one darth posted.. kindly any advise please?
Firstly, if it's on the PCV side, the filter will give you an enormous vacuum leak - NO GOOD!
Secondly, if it's on the breather side, an OCT is not needed. Just plug the nipple on the ram pipe and add a filter on the engine side.
Lastly, there's a more radical but highly polluting way to install an OCT. Plug both nipples on the air ram and intake manifold. Remove the hose for the PCV valve to disable it. Install an OCT on the breather side, one hole to the cam cover, another hole to a small filter.
In all these three cases, you need only 2 holes.