I would NOT do the K&N engine filter. Little to no real world gain vs the investment. What I would recommend is the k&n cabin filter. I replaced the factory one with a k&n and makes a noticeable difference.
I saw a post online where the K&N cabin air filter gives you 30% more airflow.
I have been using k&n for over 30 years, engine and cab air. I currently have a 4dr civic with 225,000 miles and a silverado v6 with 315,000 miles, both bought new. Both have had k&n filters since the first week of ownership. All have been cleaned and reoiled at least once a year, cabin usually twice. They all look great, and engines do not consume any more oil than when they were new. The savings in waste and money are ridiculous if you buy things and keep them. If you prefer to change vehicles frequently, probably not for you...
A fix is buying the k&n cleanable filter. It’s less restrictive but filters good enough.
Buy a K&N engine air filter and cabin air filter and replace them. They’re good for like 100k miles, you just have to take them out and bang them off in the trash every so often.
However I actually use washable K&N cabin filters. You buy once and of course it is more expensive than disposable but it pays for itself and you can easily clean whenever you want.
Been using it for the past 10 years on my Toyota. You must wash it only one way. Cannot have the water flow through it both ways. Also there is a k&n spray (pink/hot red) that you spray on the filter again every time you wash it. To me it's worth it
I have one. I clean it when it starts to smell. I just use simple green to clean it. Now, does it let more particles in that I breathe in? Probably, but no worse than breathing in the air outside. The worst cabin filter I used was the Bosch HEPA. Too restrictive and as soon as 12,000 miles hit, it was clogged and I was miserable for a few days in the summer heat
Yay. For cost and availability
They are cheap compared to others. K&N’s does not clean as well as I want it to and the HKS filters are super hard to come across (charcoal nano micro fiber????)
On certain mazdas (like my 2006, 2008.5 Mazda3, and 2015 Mazda5) it's NOT a 2 min job. It requires 2-3 hr yoga session to warm up to prep for the job, then another 2hrs trying to get in the right position as to not cramp up while trying to position 2 filters on top of each other in a space that only small children hands can access
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