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The correct type of bypass for a turbo will hang open at idle, like the stock bov.
The best thing for the turbo is to be able to instantly relief any air, from using a very easy to open bov style.
The reason people don't like to use the correct type of bov on their cars is often because they do not have a recirculated bov style.
In other words, you need the bov to recirculate the air back to the intake (pre turbo) just like FACTORY does, or else, the maf will dump extra rich fuel into the engine whenever the bov opens.
I suggest looking at the factory bov setup, the bypass style. See if you can get a BYPASS style bov. For example greddy type-s was a bypass style bov.
Always put the bov as close to the turbo as possible. Never put it after an intercooler either.
If you get bypass style bov, you can use a very easily to open bov, so the turbo will never be in *pain*.
If you cannot get the bypass style, then the best alternative solution (used to be) is HKS SSQV placed right near the turbo (within 1-2 feet or so). It won't open at idle and it will cause a little surge (a little delay to open) but it won't cause MAF issues when vented to atmosphere much either.
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