I think they are great. Saved around 500 bucks over 10 yrs.
Pros: great, cost savings
Reviews of K&N air filter
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907 votes
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They're good filters, very good, but they're not worth the trouble for most people. It's rare that anyone really keeps up with the instructions for those filters to a TEE, and not following those instructions can have repercussions. My dad used to use them, and would have me use them as well when I was younger, but they were not worth the trouble, and fouled up sensors because be didn't do X, Y, or Z properly. And when I read the directions myself, I realized he never did the maintenance properly (such as the oiling, drying). I threw mine out and his as well. If you're going to follow all directions to a perfect tee, they're really good. But that +2HP or whatever is not worth it for me.
Pros: good filters, potential for +2HP
Cons: not worth trouble, fouls sensors, complex maintenance
A K&N filter will significantly reduce engine life. It lets in more particles than the OEM filter.
Cons: reduces engine life, lets in particles
I purchased K&N drop-in engine & cabin air filters. They are ridiculously easy to access and change yourself- and you’ll never have to buy air filters for as long as you own it.
Pros: easy to access, never buy filters
Vehicle:
Hyundai Santa Fe
Mileage: 105000 km
Drop in K&N worked good for me.
Pros: worked good
Swiss cheese air filters (MWR, K&N) will do a number on your valve seats. Ask me how I know If you buy it, swap back to OEM or get a Spint DNA filter. I have a whole superbike engine build and the hp trade off isn\u2019t worth it.
Cons: damage valve seats
Mileage: 3000 km
I just ordered the K&N air filter for my 24 Trax now that’s it’s time to replace the OEM.
They also make one for the cabin filter. Not only does it save you money it saves all the waste of throwing away all the used air filters. I’ve used them for years in all my vehicles.
Pros: saves money, reduces waste
Vehicle:
Chevrolet
I had one of these, had the 1.6 Honda in it, revved to 9 grand lol. Fitted a K&N air filter and an exhaust on it. Targa roof was the best thing with it.
Pros: revved to 9 grand
Vehicle:
Honda
Return the k&n filter and stick with the stock motorcraft.
K&N but from everything I have seen/read the Motorcraft OEM paper is awesome and you don't need to find a different solution.
Pros: awesome OEM paper
Cons: no need different solution
Vehicle:
Ford Mustang
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What we know about K&N air filter
The brand is registered in USA. Official website: https://www.knluftfilter.com.
In March 2026, PartReview users have a mixed opinion of K&N air filter.
PR Score — 67 out of 100, based on 284 reviews and 907 votes. 166 positive reviews, 55 neutral reviews, 63 negative reviews. Average rating — 3.5 (out of 5). Vote balance: 608 up, 299 down.
In the ranking of the best air filter this part is at position 1 ahead of Mann and Wix.
Users also evaluated the qualities of K&N air filter:
- Power - car feels breathless on acceleration, hurting responsiveness - rated ambivalently. 2.9 points out of 5.
- Visible dirt - filter looks dark and clogged during a quick check - rated negatively. 2.4 points out of 5.
- Throttle response - delayed response to the gas pedal, reducing drivability - rated ambivalently. 3.2 points out of 5.
Air filter K&N in car-specific ratings
See which car brands and models owners choose K&N air filter for. Below are car-specific ratings where this part is in the Top-3:
- K&N ranked #1 in air filter ratings for: Honda Civic, Volkswagen Passat, Volkswagen Jetta .
- K&N ranked #2 for: Toyota Corolla .
- K&N ranked #3 for: Ford Focus, Toyota Prius .
Air filter K&N in comparisons
There are 4 comparisons of K&N air filter with other manufacturers on PartReview.
In particular, see which air filter are better: K&N or UGREEN, K&N or Fram, Mann or K&N, K&N or Wix .