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I just removed the snorkel side half of the stock intake box (snorkel = box on top of radiator) and ran with just the MAF side with my K&N filter.
It was ridiculous; completely and totally ridiculous. It was subtle and soft at normal speeds, but then, when I got on it, or hit around 3k, it just howled like an S54 with velocity stacks! It's insane, and is a little more than what I wanted.
I'll be adding spacers between the two halves and reinstalling to quiet it down, or possibly drilling holes in the sides of the box that aren't facing the engine, to reduce IATs.
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2012 BMW 328i 6-Speed Wagon | Deep Sea Blue with Grey Dakota Leather | Manual Swap, 330i Intake + Tune, 3.15 Helical LSD, Öhlins R&T
(SOLD) 2009 BMW 128i 6-Speed Coupé | Monaco Blue with Black Sensatec | chris_flies' 128i thread
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