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I'm using my stock air cleaner box, does a K&N replacement filter (cost $52) but they claim they are washable and better. Any thoughts? Cheers!
 

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K&n filters aren’t that great. They are oiled and this oil is known to contaminate the maf and cause issues. My advise, skip it and buy a regular dry paper filter.


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I wouldn't bother with them honestly. Just simply purchase a factory replacement for probably half the cost, replace it every 20-30K rather than messing with cleaning a K&N. They never come back out quite as clean as new. Waste of money.
 

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I saw a youtube video of a dyno test between a paper factory air filter vs a K&N drop in air filter several years ago. I think it was on an 2011 v6 Mustang. The K&N air filter made 3 or 4 horsepower less than with the factory paper air filter :(
 

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I had one that came in my truck which fits the mustang. I cleaned it and put it in. Could tell no difference. I def wouldn't buy one new. I still run stock air box though.
 

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K&N is fine but as said they are oiled. I run a S&B on my sho
 
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