Over cleaning a K&N does more harm than good. K&N's need dirt to be effective. Clean K&N's let through too much dirt, until they become effective.
Pros: effective when dirty
Cons: over-cleaning is harmful, lets dirt through when clean
Reviews of K&N air filter
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907 votes
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There was a "performance" K&N filter and lots of detritus in the bottom of the air box I scrubbed down the box, and it is looking fresh. Except for the super greasy valve covers and rest of the engine bay. Oh, and I'm getting rid of the K&N filter--never been a fan.
Pros: scrubbed down box, looking fresh
Cons: never been a fan
Vehicle:
Audi A4
new air cleaner (K&N cone filter)
I have used K&N filters on many applications with 0 problems.
Pros: no problems
I'm not a believer in K&N. I've always thought of it as being rather gimmicky.
Cons: rather gimmicky
Vehicle:
Volkswagen
K&N Filter Replacement
Vehicle:
Volkswagen Golf
Installed the K&N. No butt dyno difference, but overall acceleration feels smoother and there's a tad bit intake noise i can hear at WOT.
Pros: smoother acceleration, tad intake noise
Cons: no butt dyno difference
K&N is one of the worst. I run my engine in dusty conditions and was finding oily, dirty crud in my intake with K&N. I ditched it and went back to paper filters.
Cons: poor particulate catching, oily crud in intake
Vehicle:
Nissan
K&N if it's available. Million mile warranty, and never need to purchase another filter... ever. All you have to do is every few months take it out and clean it, then spray with the recharging oil and reinstall. I've had one on every single vehicle I've ever owned. The HP and MPG gains are smaller than advertised, but still noticeable.
Pros: million mile warranty, reusable, noticeable gains
Cons: gains smaller than advertised
Vehicle:
Nissan
Removed the K&Ns for some new paper filters. It'll suck to lose the 10% horsepower gain but I'll try not to die trying to pass Ford Flex's on the highway without it. The air box had a bunch of dirt/scum so I cleaned that out too.
Cons: lose 10% horsepower gain
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