the benifit of connecting them is gasses would be sucked out of the motor and burned, the way you have it now the gasses just breath out. The best way it to do it is make use of a pcv valve. A pcv valve does two things it won't allow liquid gasses from entering your throttle body gumming it up, and if your motor back fires it does'nt allow the backfire to travel into your valve cover (possiable but not likely ) which could cause a fire