Whats the basis of these? Do they eliminate the need for a catch can? I assume two of the inputs are for crank case and cam breathers, these pass through the air/oil separator and the outlet goes back into the inlet? Anyone used one or know how effective they are? Worth replacing catch can setup with one? Whats the go with the emission laws at the moment, are catch cans vented to atmosphere being ruled out? If so, would the air/oil separator be a feasible alternative? Cheers