Looking at oil catch cans, I've had the pcv just going to a filter, but that doesn't give the positive vacuum of pulling the gasses through the intake. When looking at the m7 one, they mention the rh and lh outlets. What's the difference between the two, so far I've only had the one on the right hooked up and hadent touched the left one.

 

should be like this...

https://www.northamericanmotoring.co...an-how-to.html

except you really dont have to remove the IC to get to that other line (grey one).
the oily crap will come out of PCV, through filter, back into the intake like it should.

M7 does it wrong. plain and simple. Dont follow those instructions!

 

Yeah this i haven't really looked at the Pcv system too much yet, right now I have it running to a filter mounted near the air filter to try and draw Iin some aire. I want to make my own catch can system and I was just wondering what the one on the left is. Is it just another exit, or does it vent a different section of the engine or what?
I when I built my custom cai, I didn't feel like adding an inlet for it

 

We recommend just hooking it to the PCV valve on the passenger side to prevent anything from causing it to blow out the engine seals. We also use the BSH can as it is the best for the R53