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So do people want to do this to get the cool sound or are they producing much higher pressures than stock to warrant it?
From my understanding to convert to a BOV you'll have to know the engines flow if vacuum to build your BOV. When converting a car from NA to turbo, most of these values are already known.
It seems that the S63 diverted valve is controlled by the car's computer unlike a physical device like a BOV. If you want that cool sound, you prob could just connect the bpv to a device that produces a certain sound when air flows through. And also seal the inlet port where the bpv normally puts the air before getting charged so it's not sucking unflilterd air from the engine bay.
From my understanding the air in this area is not being metered so the computer wouldn't know volume of air that would be escaping the system. A way to test this is create a vacuum leak in certain areas of the intake system and see if you get a check engine light. Do this to most NA engines or the S63TU and you'll prob get a checked engine light.
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