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...
I do mine every time i do my oil, I buy Mann carbon impregnated ones
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.
I just buy the MANN filter at o reileys and change it myself.
Besides the need for washing and re-conditioning, these filters also have the drawback that they were originally designed for increased airflow to the engine. For one, we don't have an engine to begin with. What we need is good cabin air. In this sense, the increased airflow is counterproductive as it lets more "stuff" through than regular filters. If you want the best cabin air, I would recommend a carbon-coated cabin filter. I have been using and have had no issues with air restriction, and I believe the air is better air compared with the other two vehicles in our family (but they are ICE vehicles, so who knows).
Bosch with charcoal, DO NOT USE KN CABIN FILTERS, you’ll be very unhappy with them. Tried them for 4 years, sure cleaning was easy, but they did not filter any orders, if anything they made them worse. Switched back to Bosch.
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