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BeemerMeUp · 05-24-2011, 11:16 PM

The original air filter has foam in front of the element, and
the K&N 33-2231 Replacement Air Filter does not have foam
in front of the element. I heard it would run "lean".
Any suggestions

05-24-2011, 11:16 PM	#2
BeemerMeUp Registered User Join Date: May 2011 Location: California Posts: 4 My Ride: 330i Sports Edition View My Garage	The original air filter has foam in front of the element, and the K&N 33-2231 Replacement Air Filter does not have foam in front of the element. I heard it would run "lean". Any suggestions