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2012 outback 2.5 limited
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16 Posts
Discussion Starter #1
i just got my k & n air filter for my 12 outback 2.5 and when i opened my filter housing i have two filters in it. do i need to take both out or leave the thin one in? and what does the thin one do?
 

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'11 outback 2.5i premium '12 impreza sport limited
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3,814 Posts
see if you can return the k&n filter and get an aem or similar dry flow filter. you have more power because almost no filtration, the dry flow ones work just as good or better, but you dont have that nightmare of re-oiling and the worry of excess oil fucking up your MAF sensor. interesting there are 2 filters though, i have a 2011 outback and a 2012 impreza and there is only 1 filter.
 

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2012 outback 2.5 limited
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16 Posts
Discussion Starter #3
Ya the regular filter, then it has a thin like pre filter which is like a cloth material enclosing something. Maybe something to do with pzev emissions
 

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2012 outback 2.5 limited
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16 Posts
Discussion Starter #4
I just checked aem website. It is a charcoal filter part of emissions and said not to be removed. Thanks for the help. I now know to get the aem next time. Not sure if i feel like returning k&n.
 

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Registered
'11 outback 2.5i premium '12 impreza sport limited
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3,814 Posts
well, the K&N should give you no problems, problems are the rare case, ill just never buy that kind of filter again. re-oiling sucks. i have only learned this in the past few years.
 
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