Thank you. I had in my mind that you can give good answer.

So you will put oil catch can which is not connected to inlet (air filter) ?

Can I just leave oil breather pipe in standard air box (air box with filter but not connected to inlet) and leave air filter (k&n) alone without oil breather hose ? I will put oil breather pipe in old air box just to prevent dirt getting into pipe.

so will not be problems with oil vapours ventilation,cranckshaft ventilation or oiling the valves or something?