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N55 has a good PCV system. A catch can in an N55 is just clutter in the engine bay that does nothing. I think that because the N54 had quite an average PCV system its easy to re-purpose a product and market it to the newer engine too.
The BMS catch can is a high flow design as it would impede the PCV system otherwise. A high flowing catch can does not catch much oil. Even on the N54 it doesn't catch much oil
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