not much point in it unless you fitting a oil catch tank.
I never knew how much oil came up that pipe untill last weekend in the ring..... didn't have a breather filter on the tank, just left it open (didn't think any would spill out lol) guess it's the pressure in it.
Anyway what I mean with just a breather filter on it instead of the pipe going back into the air filter it will just let oil go over the engine once the filter gets full of oil. Reminds me, I need to order one lol