Focus ST GFB DVX Diverter/BOV Install 

Have it installed for over a year now, its great quallity. you can adjust it to taste get more or less blowoff sound play around with it. I routed the BOV to true vacuum by adding a hose going from the intake manifold to the top of the valve cover the stock connection has the diverter valve attached to a solenoid on top of the valve cover, i released the line coming from the diverter valve and attached it to the newly added hose, then i blocked the now open port of the solenoid. The BOV is now vacuum controlled instead of using the ECU to tell it when to open, this will keep the valve shut instead of opening it all the time when letting of the gas and the BOV will be more snappy. I used a Mountune cast intake manifold which has a port on the side to add a bung yourself for a boost gauge or vacuum hose.

There’s a couple videos I found on here with the install I been waiting to put mine on after I get my car back

Volume adjustments doesn't change the spring pressure, all it does it change how much air is vta and the pshh sound. The adjustment screw changes the spring tension. 2:53 When its entirety closed its just recirculating like a dv. Fyi