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Has anyone found aftermarket cabin and engine air filters and confirmed that they fit? The OEM ones are expensive and I would like a higher quality cabin air filter. I've looked at various sites and can't find any.
 

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Discussion Starter #3
I’ve purchased STP cabin air filters at AutoZone and they fit fine. Part SA9997
https://www.autozone.com/external-engine/air-filter/stp-air-filter/904257_0_0
The part number you provided is for an engine air filter but you say you bought a cabin air filter. The cabin air filter that I see at AutoZone (https://www.autozone.com/filters-and-pcv/cabin-air-filter/stp-cabin-air-filter/498535_0_0) has a plastic edge. The 2017+ Impreza cabin air filter has a cardboard edge. Can you confirm exactly what you bought and what it fit?
 

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I got both foy my 2017 2.0, the engine filter fits snug, the cabin filter fits loose but k&n said it was designed loose as the electrostatic part draws particles toward the filter.... Both currently working since Feb 2019

Bought the cabin filter direct from k&n:
https://www.knfilters.ca/mobile/mProduct.aspx?product=VF2054

Engine filter from eBay: pn #33-5064
 

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"the cabin filter fits loose but k&n said it was designed loose as the electrostatic part draws particles toward the filter.... "

I'll have to call BS on K&N on that one, it makes absolutely no sense in any way. Air filtration systems are not designed to have leaks and electrostatics are not used for airflow. Do they actually print this or was one of their employees making this up as he spoke? It's not as easy to make a part fit like OEM as many think.
 

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Has anyone found aftermarket cabin and engine air filters and confirmed that they fit? The OEM ones are expensive and I would like a higher quality cabin air filter. I've looked at various sites and can't find any.
The OEM filters are far from expensive and literally a perfect fit. I don't see what there is to complain about.

Cabin Air Filter: https://www.subarusource.com/oem-parts/subaru-filter-72880fl00a

Engine Air Filter: https://www.subarusource.com/oem-parts/subaru-filter-element-16546aa16a
 

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I just don't get why some like to make the simple things complicated. Filters are cheap, especially if you aren't paying someone else to install them. I've never seen a Factory part that didn't fit, aftermarket stuff sometimes doesn't fit as well.
 

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The OEM filters are far from expensive and literally a perfect fit. I don't see what there is to complain about.

Cabin Air Filter: https://www.subarusource.com/oem-parts/subaru-filter-72880fl00a

Engine Air Filter: https://www.subarusource.com/oem-parts/subaru-filter-element-16546aa16a
Thanks for those links. I think the MSRP is too expensive, but with those discounts the prices aren't bad. Regarding the cabin air filter specifically, I was hoping for a higher quality one, particularly one impregnated with activated carbon. I have activated carbon air filters in my home and used them in my old car. I really benefit from the improved air quality.
 

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There are lots of aftermarket cabin air filters. I've used this brand before:

TYC 800021P

However when it comes to engine air filters, I prefer Green Filters over K&N. I've used K&N for decades until I discovered Green Filters. They are just made better and hold up well after repeated cleanings. I had one on my 04 Forester XT and my BRZ. Below I have a comparison of the K&N and Green Filter I used on my Forester. The rubber used to hold the K&N filters always encroach on the filter material and after repeated cleanings the gauze filter material on the K&N seems to shrink. When held up to the light you can see small openings. The Green Filters are made of a different type of cotton materiel, it seems a lot more durable. The frame is stronger too. I could only find the one for my Impreza direct from them though. They sent it out the same day. https://store.greenfilter.com/products/7256?_pos=1&_sid=e81053fcd&_ss=r&fbclid=IwAR02PmLmFD3T_iqU2P9-PIooLuYfmIbLlmmEw1xVydFjNUPP50ejk8OqGMs



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Once again, those "oil and clean" filters offer better cost per usage, at the expense of actual filtration of air going into the engine. When tested as to actual filtration efficiency, they are actually the worst filters you can buy. Racers love them because they reduce drag on airflow just a bit over more efficient filters, thereby giving you just a tiny bit more power and flow. But then racers overhaul motors often on a schedule of maybe 10,000 miles or less, so they don't care about the damage done from small elements scoring their cylinder bores.

So, yeah, if you don't mind having a car that burns a quart of oil every 200 miles when it's 6 years old, go ahead, put those filters in. I'm certain the way-cool sticker on your window is worth all that in the end......
 
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