Who here has removed the second permanent filter from the airbox?

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Feb 8, 2011 | 08:26 AM

#11

chalankanoa

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Joined: Jan 2009

Posts: 75

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From: Hawaii

My Ride: 2006 BMW 550i CPO bought in Jan 2009

I removed mine. I did not notice any HP or MPG gains. No problems either

Feb 8, 2011 | 06:38 PM

#12

Sublime

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Joined: Sep 2010

Posts: 568

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From: LA

My Ride: 2012 535i M-Sport

i took mine off just because it says not to - I really didn't notice a huge change.

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