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      12-16-2012, 01:54 AM   #28
Alext
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Drives: B M W
Join Date: Apr 2008
Location: Everest

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BMW spend literally tens of thousands if not hundreds developing the stock air intake (which happens to be a proper sealed cold air intake) for their N54 engine for good reason.

I had a BMS intake for my 135i and can't say it increased power; in fact I noticed that on hot days (esp in traffic) it felt more sluggish than the stock intake back to back.

Some N54 flash-tuners have found consitently good results with the stock intake + drop-in. I have been personally recommended by a very well-known and established BMW tuning company to stick with the STOCK intake + drop-in rather than go for a DCI, at flash-only tune + exhaust levels.