Venting on a 1/2/3g mas can work, but it's not correct. It's just not a performance oriented mod, usually opposite.
The stock bov leaks at idle, most aftermarkets don't. When you have a stocker recirc'd, it's fine because that's all happening after the mas. When you vent it, you introduce a constant vacuum leak. Problem 1.
When your bov vents to the atmosphere instead of back to between the turbo and mas, you are running pig rich. The ecu used the mas to measure the all air entering the engine. When you dump that air into the engine bay instead of your intake pipe, the mas will never know, therefore the ecu will never know. X amount of fuel was added, but Y amount of air isn't there. Problem 2.
Say you boost leak test up to 20psi and it holds so you figure everything is fine. You someday run 30psi and your vented bov begins to leak at 25psi, you are now losing calculated air. I suppose you would tune around it, but why? Sounds awful. Problem 3.
