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Flex said:

No offense to you, but your friend doesn't really know what he is talking about. BOV's let off only compressed air, as in Nitrogen/Oxygen. BOV's effects on emmissions, I don't know, but they do absolutely no harm to the environment.

Maybe he was thinking about open air wastegates which are far from legal.

Somebody correct me if Im wrong
Yes, a BOV only releases air into the atmosphere, not anything harmful.
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