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Old 09-04-2012, 03:44 PM   #1
Badtiming
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Default K&N Drop in air filter

Anyone have any experience with the K&N drop in filter? I have looked around and only saw mixed reviews for wrx owners. Anyone have experience with this filter in an 08+ 2.5i ?
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Old 09-04-2012, 03:56 PM   #2
cal_look_zero
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I'd avoid K&N. Oiled filters are a huge pain in the arse.

I like the Apexi dry filter myself.
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Old 09-04-2012, 08:34 PM   #3
Steve2.5i
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Quote:
Originally Posted by cal_look_zero
I'd avoid K&N. Oiled filters are a huge pain in the arse.

I like the Apexi dry filter myself.
This +1
If you like an oiley maf then yes lol
IMO the OEM filter works as intended.
You wont see any gains with a different filter. The stock intake system is fine. Although if u still want some form of intake read the sticky on the hybrid intake or buy an intake n get it tuned asap.
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Old 09-04-2012, 09:15 PM   #4
JDMBlake
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Ive spent about a month calling everyone to figure out what to do to my 08 2.5i. The best thing i can tell you is to work on the suspension and the looks of your car. The OEM filter will work fine and you truly wont gain anything, wont even sound different. If you really want to you can make a hybrid intake and maybe get a lightweight pulley ^.^ thats what i did just to say i did it. lol best of luck fellow Subaru owner!
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Old 09-04-2012, 11:06 PM   #5
Steve2.5i
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Quote:
Originally Posted by JDMBlake
Ive spent about a month calling everyone to figure out what to do to my 08 2.5i. The best thing i can tell you is to work on the suspension and the looks of your car. The OEM filter will work fine and you truly wont gain anything, wont even sound different. If you really want to you can make a hybrid intake and maybe get a lightweight pulley ^.^ thats what i did just to say i did it. lol best of luck fellow Subaru owner!
Really depends on how deep ur pockets r lol. Reason they tell u work on suspension is because the HP to money ratio is redonk. From what I've seen a good set of EL headers, 1500 grinds, valve springs/retainers, and a tune will put a smile on ur face.
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Old 09-04-2012, 11:28 PM   #6
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But that's gonna cost around 1000-2500 out the door. A lot of money for 35-40 HP. It's worth it for me though. I'm hitting 1500s, springs, and a good tune. I already have EL and intake with no cats
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Old 09-04-2012, 11:44 PM   #7
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Quote:
Originally Posted by Sleeper_RS
But that's gonna cost around 1000-2500 out the door. A lot of money for 35-40 HP. It's worth it for me though. I'm hitting 1500s, springs, and a good tune. I already have EL and intake with no cats
Hence why I made the remark on the deep pockets.
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Old 09-04-2012, 11:48 PM   #8
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I have the K&N drop in panel filter and I have had no issues. I have not oiled it yet but honestly if your smart enough to not drench the filter when you do decide to oil it then you should be fine. As soon as I put mine in the idle dropped a little bit and the car seemed to breathe a whole lot better. I have this paired with a hybrid intake and I have not had any issues occur.
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Old 09-05-2012, 12:33 AM   #9
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Quote:
Originally Posted by Steve2.5i View Post
Really depends on how deep ur pockets r lol. Reason they tell u work on suspension is because the HP to money ratio is redonk. From what I've seen a good set of EL headers, 1500 grinds, valve springs/retainers, and a tune will put a smile on ur face.
What kind of EL headers will fit my car?
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Old 09-05-2012, 01:46 AM   #10
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Quote:
Originally Posted by KartRacer3 View Post
I have the K&N drop in panel filter and I have had no issues. I have not oiled it yet but honestly if your smart enough to not drench the filter when you do decide to oil it then you should be fine. As soon as I put mine in the idle dropped a little bit and the car seemed to breathe a whole lot better. I have this paired with a hybrid intake and I have not had any issues occur.
I have one too and I agree as well. My MPGs has seemed to increase by 1-2.
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Old 09-05-2012, 11:53 AM   #11
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UOAs on bobistheoilguy.com have consistently shown more dirt in engines with K&N filters.
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Old 09-05-2012, 12:57 PM   #12
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Quote:
Originally Posted by Counterfit
UOAs on bobistheoilguy.com have consistently shown more dirt in engines with K&N filters.
Do you always believe what you read on the Internet jk, I'll have to look that up.
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Old 09-05-2012, 01:02 PM   #13
Steve2.5i
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Quote:
Originally Posted by Badtiming

What kind of EL headers will fit my car?
TWE El headers
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Old 09-05-2012, 02:31 PM   #14
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TWE= $$$$$$$ but supposedly really good
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Old 09-05-2012, 03:12 PM   #15
Steve2.5i
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Quote:
Originally Posted by Sleeper_RS
TWE= $$$$$$$ but supposedly really good
Obx El then lol. Performance parts r never cheap n/a or not.
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Old 09-05-2012, 03:40 PM   #16
Badtiming
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I cant even find TWE headers for my car.. and if i go OBX, wont i have to get a custom midpipe made? Price isnt really a concern if its gonna bring my car to almost 200hp. im not looking to race it or anything but a little extra kick would be sweet.
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Old 09-05-2012, 03:52 PM   #17
cal_look_zero
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You're getting nowhere near 200whp until you split cases and put in something that require 91+ to run. You might, MIGHT see 160whp with cams, high quality I/H/E, and a tune.
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Old 09-05-2012, 03:57 PM   #18
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call me a noob but i thought i had 178hp or something like that
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Old 09-05-2012, 04:04 PM   #19
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Not at the wheels you don't.
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Old 09-05-2012, 04:23 PM   #20
Badtiming
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ahhhhh gotcha.
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Old 09-05-2012, 05:16 PM   #21
cal_look_zero
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You have 165 at the crank; per factory specs. Which means you're pushing around 130hp to the wheels at a liberal estimate. To achieve 200whp, you'd be pushing about 250 at the crank or better; more hp than a stock WRX.

200 crank hp will put you around 160 wheel hp which is respectable. I won't claim a number until I dyno, but a very similar build to mine was making 177hp at the wheels (NA) which translates to about 220 at the crank; slightly higher than a WRX.

Basically, take whatever hp you make at the wheels and multiply it by 1.25, or whatever you make at the crank and multiply it by .8. 20% drivetrain loss is a loose guess, but is close enough for estimations.
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Old 09-06-2012, 01:30 AM   #22
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Quote:
Originally Posted by KartRacer3 View Post
Do you always believe what you read on the Internet jk, I'll have to look that up.
So are you going to switch another drop in air filter?
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Old 09-06-2012, 03:40 AM   #23
Bababou
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I've had no issue with the K&N drop in, its been on the car for about 9 months. I've cleaned and re oiled it a few times and have checked the MAF each time and its not throwing oil every were, you just have to be smart when oiling the filter. I picked up 2 MPG and like Kartracer said you can hear the car breath better.
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Old 09-06-2012, 07:27 AM   #24
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I am running the OEM paper element in my 2012 2.0L until I hit about 2500miles then I will put my Perrin element in but the KN is an option. I ran KN in my 84 Corolla GTS, 89 Mustang GT and 98 GTI-VR6 with no issues but I am a little leery with MAF sensor.
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Old 09-06-2012, 01:04 PM   #25
Oregonoutback
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I had a K&N on my last OB, and it did seem to get oil on the intake tube, and the MAF sensor. I cleaned the MAF with special cleaner and it was fine after that. My OBS came with a K&N in it but I think I'll look at dry elements in the near future. I really didn't notice any gains or losses with the K&N either.
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