I haven't seen a thread yet with the Moroso universal 85474 air oil separator. I was having a bit of rough idle fixed by cleaning the throttle bodies. Not wanting to have this problem again I decided to install a catch can. The Moroso unit isn't the cheapest, but is well built. The hose with the kit would be long enough for the stock G37 manifold, but since I have the Motordyne manifold I had to but a longer hose.

After ~1 month of use, I had at least a tablespoon of oil collected. Definitely good not to have that in the intake.

I had to make a custom bracket that I thought might be helpful for others to see. It fits to existing bolts by the radiator, just needs one longer bolt and nut to connect - see picture 2.

Connections are the same as others - tee into two lines in front of the manifold, and for the motor dyne, return one line to the back of the manifold.




Custom bracket




Bracket in place




Separator installed