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Any benefit to K&N Filters on a stock X5M? Any benefit to K&N Filters on a stock X5M?
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Old 08-16-2014, 12:34 PM
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Any benefit to K&N Filters on a stock X5M?
I was looking over the wives car today and pulled the air filters. They definitely need to be replaced and was curious if the K&N replacements offer any benefit. I've seen that on some stock cars they actually cause a leaner AF Mixture causing CEL's and whatnot but i was curious if anyone here had any experience or insight.

Also...what are the white filters behind the air filters? They also looked pretty cruddy.

Thanks in advance.
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