I've used Denso and I'm running Bosch right now. They both work great.
Pros: work great
Owner reviews for air filter
Manufacturers
Comparisons
2020 wrx premium has 217000 miles, stock except K&N air filter. Change oil every 6000 miles and tap out and remove debris from air filter every 3000 miles and clean every 6000.
Vehicle:
Subaru
Mileage: 347220 km
OEM filters will generally run you $30-$60, you can get cheaper ones like Fram as well.
Pros: cheaper ones available
Can confirm Fram CF12772 fits. I have replaced mine twice.
Vehicle:
Ford
Part number: CF12772
So I went out and bought Bosch aftermarket filters and changed them out myself.
Pros: bought aftermarket filters
Vehicle:
Ford
Mileage: 23000 km
replaced OEM with K&N 6 months ago and have not had any issues
Pros: no issues
I did this to my 7.3 and 6.0. Did I notice anything? Not really. But mechanical and engineering theory it will do something. How is it called a "cold air in take" if its sucking the hot air within the engine bay?
Pros: mechanical and engineering theory
Cons: did not notice anything
I’d do have a K&N air filter which is supposedly good for better mpg.
Pros: better mpg
If not, get rid of that K&N. High flow air filters let everything in, you do not want road dust a debris getting into your engine, and a K&N is the best way to causing that.
Cons: lets everything in
The reusable filters don’t filter as good as the paper ones you throw away. I can’t understand why anyone recommends drop ins. Just do any amount of research and everything says the OEM style paper filters that are meant to be replaced have a far better ability to filter the air being taken in. I guess the only benefit to the reusable ones like K&N or aFe are the longevity factor meaning you can clean and reuse so they cut down on maintenance cost a little.
Pros: longevity, reusable
Cons: poor filtration
Vehicle:
Infiniti Q40
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