Our vehicles are equipped with a MAS system. These sensor units read the air that passed thought them by heating up a "hot wire" or similar to a toasters internal heaters. Air then travels over the hot wire. The wire's electrical resistance increases as the wire’s temperature increases, which limits electrical current flowing through the circuit. This is how the ecu calculates how much air is entering the system.
Our MAS systems are before the turbo, so the air is metered entering the system. This means that the ECU calculated the air before the turbo, if you are release air after this sensor the ecu can not properly calculate how much air is n the system. It is considered to be un-metered air. That is why boost leak tests are so important, un-calcualted air enter or existing the system can mess up your fuel to air ratio.
If you want to vent, vent properly. Utilize another system of calculating air, whether it be a GM blow through style MAF or Speed density (map sensor and air inlet temp). These two systems calculate air that is in the system rather than before/entering.
I dont think you searched hard enough:
Venting your BOV to the Atmosphere
edit: nice link Bud, great minds think alike