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Originally Posted by ocso1606
The "Whoosh" sound is the turbo blow-off valve releasing air upon accelerating and pushing clutch in. Not hurting the car at all. Im looking for proven DYNO results before buying an aftermarket CAI. Thje BMW M intake is way too much money for the small gain, i think it was 5hp ONLY
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I doubt the N55 has a BOV, but rather a recirculation valve that will not just blow off the pressurized air to ambient. Give this a read, it's a good technical article on air intakes written by Trey Cobb. Keep in mind this is coming from a guy who wants to sell you an intake.
http://www.cobbtuning.com/Technical-Articles-s/70677.htm