Like this. Nice and simple. The small vacuum hose running from the intake manifold to the BOV tells the BOV when to open. When you let off the gas and the throttle body snaps shut, the manifold goes from boost to vacuum, and that vacuum pulls the BOV open. The purpose of the BOV is to relieve the pressure in the intake tract (and if you're recirculating, also to avoid losing that air and confusing the MAF). So you have to connect a hose from the BOV, which is mounted on a high pressure area (intake tract after the turbo, which includes your hot pipes, cold pipes, and intercooler) to a low pressure area (rubber intake tube, after the MAF). The BOV simply opens and allows the pressure to equalize between the high- and low-pressure areas.
