You may be aware of my other thread:
How to Install Oil Catch Cans
where I am showing this picture:
This is when we assumed that there is only one PCV related hose. I drove some 5000 km with this set-up, then
@GTB suggested, we should look a little closer.
No 90 degr. elbows were used, and you are looking at 2 cans connected in line. The ports next to the word "OIL" on top of the cans were then the "OUT" ports,
the ports next to the word "CAN" were the "INCOMING" ports in this set-up.
I did the fabricating, and with the cans mounted to the bracket, went to my mechanic who cut two pieces of 3/8" hose and made the connections.
In this version, a switched the port designations - IN became "OUT" and OUT became "IN".
Here is the reason why I did that:
As you can see, the originally designated "IN" port has a baffle that can be unscrewed.
I thought it would be more effective if I make this the OUT port in the next iteration and add filter material to the baffle.
That way the "gunk" stays in the can before the fumes are sent out to the engine.
In this, the final version (hopefully), the hose connecting the then OUT port on the passenger can to the IN port on the (future) driver's can
was removed and the hose on the OUT port of the driver's can was moved to the to the passenger can and the insulated OEM hose played musical chairs
and moved one over on the same can.
My apologies if it sounds a bit confusing. But I did not only change the cans set-up but also the ports at the same time.
I then asked my mechanic to cut into the second PCV on top of the engine, and to make it work, he used 5/8" hose.
We had previously discussed to run the new hoses near the firewall, otherwise, it would interfere with the plastic engine cover.
And that's what he did.
If you need to know anything else, just ask.