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Old 10-17-2008, 08:00 PM   #1
05ASPINREX
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Default Best Drop in panel Filter

just replacing filter just wondering what you guys have used
hks, perrin , k&n? thanks alot
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Old 10-17-2008, 08:06 PM   #2
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I know when i had my Audi, the best drop in filter was the OEM paper one because the oil from the after market filters would mess up the MAF readings..dont know how true that is, or how it works with subies, but that was what i was told w my old car
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Old 10-17-2008, 08:06 PM   #3
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Best for what? Filtration or breathing? You'll find that paper filters are best for that part, and oiled mesh/foam filters are better for the latter, but not so much at the former.

I use OEM papers myself. I've never been able to tell the difference in my butt dyno, and isn't that what matters anyway? Furthermore, if you overoil your mesh/foam filter during maintenance it will contaminate your MAF which throws off the way the vehicle runs. Sort of defeats the purpose.
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Old 10-17-2008, 08:07 PM   #4
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Quote:
Originally Posted by BONFIRE074 View Post
I know when i had my Audi, the best drop in filter was the OEM paper one because the oil from the after market filters would mess up the MAF readings..dont know how true that is, or how it works with subies, but that was what i was told w my old car
I'm a drivability tech and yes dirty MAF sensors can cause issues.
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Old 10-17-2008, 09:13 PM   #5
424wrx
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i have the avo panel filter.its nice because its a dry element type.
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Old 10-17-2008, 09:34 PM   #6
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my perrin worked great, never had a problem with any bad maf readings on my data logs
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Old 10-17-2008, 09:44 PM   #7
hiboost21psi
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i put a k&n filter in my 2002 wrx and had it in there for about 1 1/2 years and never had an issue... but i could see it getting the maf dirty with the oil.. but if it did you can clean it with some electrial cleaner not a big deal....
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Old 10-17-2008, 09:44 PM   #8
JoeSUBARU
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Almost positive they will all do the same job, just preference and $ difference really
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Old 10-17-2008, 11:30 PM   #9
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Amsoil. No oil/ gauze just reusable reinforced paper element. Like stock with more efficient filtration and ten times the service life.
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Old 10-18-2008, 06:29 AM   #10
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http://forums.nasioc.com/forums/showthread.php?t=477393

There is no best filter, but the best in terms of long term longevity is the OEM unit.
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Old 12-02-2014, 11:47 PM   #11
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Ive been searching the site and I think this is the best place for my question...if not please move it or show me the way....this post is dated a few years now.. what is everyone using now for the drop in filters? I have a 2015 STi... from what I can tell the K&N is crap and AVO seems to be a soild option bc it is dry filter....what about the Perrin Foam one? I think one I saw said "for off road use only" any ideas why?

Thanks
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Old 12-03-2014, 06:31 AM   #12
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OEM..

And even at 6 years old post #10 is the best answer.
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Old 12-03-2014, 08:58 AM   #13
cmiovino
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Given you are referencing a 2015... OEM is now. Others throw off MAF readings.

For older models like the OP's 2005, I would have recommended Apexi or AEM... just for kicks, no real reason. OEM would work there too.
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Old 12-03-2014, 01:48 PM   #14
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I appreciate the input. Fairly new to forums, I knew there had to be a thread already made I just couldn't find it. So if I were to go with a dry element drop in...no oil to jack up the MAF...just for the hell of doing it, do you think I would need a tune of some sort?
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Old 12-03-2014, 01:54 PM   #15
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Quote:
Originally Posted by Bobster00 View Post
I appreciate the input. Fairly new to forums, I knew there had to be a thread already made I just couldn't find it. So if I were to go with a dry element drop in...no oil to jack up the MAF...just for the hell of doing it, do you think I would need a tune of some sort?
No tune required...but little benefit to performance. AEM dry is my favorite.
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