Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - K&N Drop-In/Stock Housing Lid
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Old 09-16-2012, 05:57 PM   #23
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Originally Posted by Justintoxicated View Post
I love the AEM myself, they provide better filtration than K&N, but aren't they also usually a bit larger to allow the same airflow as a K&N?

Will it fit with the lid on?

Will any of these help increase MPG? (id assume they would only help when the engine is revved up high which probably negates any gains?)
The AEM is a cone opposed to K&N's cylinder so the filter's surface area will be smaller. Both filters have a 6.25" base diameter, but the aem tapers to 5.25".

So the lid should fit.
What's that?? You'd like an eco-tune...
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