Originally Posted by COSPEED2

Here is what the shop should follow as for diagrams of all involved with turbo or centrifugal super charging:

So all understand,

The E2, E2-X, and E2-Ultra all use 2 separate evacuation suction sources. While in non-boost operation, the intake manifold vacuum provides evacuation suction with the cleanside separator providing filtered fresh make up air that replaces the foul/dirty contaminate laden vapors being removed from the opposite valve cover as the filtered fresh air is entering.

When the engine begins to transition into boost, the primary checkvalve will close as pressure is detected int he intake manifold, and the secondary valve will open using the vacuum/suction present at the head units inlet to continue pulling suction at all times on the crankcase. The main separator (catchcan) traps 95% plus of all the oil mist and other contaminates (water, unburnt fuel, abrasive soot/carbon & Ash) from the crankcase vapors so only scrubbed vapors enter the intake air charge. The billet cleanside separator will trap any oil mist present during any brief periods of pressure as the checkvalves switch, etc. so you have addressed all paths of ingestion while maintaining a emissions compliant "closed system" legal for street use.