His set-up fights gravity...where it goes up over the rear cylinder.

you'll see the earlier type hi flow breathers had spigots on the bottom of the headbolt banjos, which then drained to ground ( or to backing plate)

the drain end of the hose should have a small filter or a PCV valve on it

Mike

 

My first setup was going down (not fighting gravity) with a filter but I didn't like it. Here is the picture of my first attempt.

I didn't like the cluttered look and I didn't want the filter dripping on my cam cover. Running a hose along the frame to the ground is a very clean setup.
All three bikes and my car have a design that fights gravity but I've never had any issues. I know that it's working because every now and then I have a little bit of foamy oil on my garage floor upon starting up the vehicle.

 

Ok I like it...now how would I do this with a stock air box I dont like oil blow-by mixing with my fuel, I've seen what burnt oil does to the inside of an engine?

 

If I remember well, the stock airbox has that plastic liner around it. What I would do is locate the breather bolts, drill holes in the plastic liner, run hoses from the breather bolts to the outside of the airbox, connect them with a T and run the hose to the ground (that's what I did) or to a small filter. Make sure you plug the holes where the hoses used to go inside the air filter so that the bike doesn't suck in unfiltered air through them.
It should be easy to figure out once the airbox is apart.
Good luck!