907 votes
Been using a K&N on my car since 1996 or 1997 when my car had around 90k miles. Car currently has 505k miles. I clean it once a year. It flows like a new paper filter even after 20k miles. I still use a paper filter whenever I have to wait for the K&N filter to air dry after cleaning it.
Get an K&N or HKS air filter and never buy another filter again. They usually come with a cleaning kit which is used once a year. One of the better investments I’ve made for my car.
K&N high flow lifetime filter. Higher airflow (you'll hear turbo spool and gain a few HP), and you never need to change it - you can wash it after 50-70,000 mi, or whenever you feel it's dirty enough to clean, but you've never got to buy another filter again...
I used a K&N on my ALH, turbo was trashed in 15000 miles due to dirt getting through it.
These k&n air filters are trash. They basically dont filter at all. Thats how they achieve increased air flow.
I 3d printed and designed a cold air intake adapter that works like the Neuspeed intake. I put a big ol’ K&N filter on it and made the car much better on levels of acceleration and throttle response.
I removed the air filter (standard, paper one) and found it clean. I replaced it with a K&N anyway.
I use K & N filters on all my vehicles, both air and cabin, probably around $100.00 for both. They are a lifetime filter, they need to be cleaned occasionally, about every 30k or so, but you'll never need to buy a filter again! It made a difference in performance of my Pilot and every other vehicle I've owned.
I am not a fan of K&N filters because they have to be cleaned and supposed to be air dried because blow drying can tear the media. I'll be damned if I'm going to notice my air filter is dirty and have to set aside a few hours of my day for it to dry in the sun before I can oil it and drive again, I rather just buy a $10 filter and be done.
Not to mention if you apply too much oil it can get into the MAF sensor and from what I've seen they also have less surface area than a paper filter, albeit they probably don't need the extra surface area, but it does mean they can clog faster.
I don’t recommend reusable performance filters since they can alter air flow enough that you end up running a little lean with a turbo charged engine. This is why a lot of turbo charged engines can’t just have a cold air intake slapped on without a tune. This actually occurred with my 08’ Subaru Legacy GT. Stick to a quality standard filter that offers optimal air flow and filtering capability.
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