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Why on earth is this thread still open?
Reading on e90post, it does sound like the N54 is MAP based and therefore could run a BOV with no issues. The air IS directed back into the intake, but probably for the sole reason of not adding that pshhhh sound that would drive most bimmer owners crazy!
Its completely personal preference of the owner if that is true.
And for those that want to slap on a BOV, you better find something to plug three holes with, because the N54 has 2 stock recirculating valves.
/thread... seriously
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