View Poll Results: Which Drop In Air Filter Do You Use With OEM Box?
K & N
33
58.93%
Green
1
1.79%
HKS
4
7.14%
OEM STI
6
10.71%
Other?
12
21.43%
Voters: 56. You may not vote on this poll
Drop In Airbox Filters?
Thread Starter
Registered User
iTrader: (2)
Joined: Feb 2006
Posts: 1,900
From: Baja Oregon
Car Info: '05 Impreza Outback Sport ~ "WTF! Two-Toned?"
Originally Posted by SubySal
I don't doubt the test results, but I'm a diehard K&N fan and here's why. A few years back I had a '78 FJ40 Toyota Land Cruiser that spent alot of time on trails. One spot we frequented had this fine silt that made it's way past the stock paper filter and collected on the throat of the carb. I told one of my friends about it and he recommended a K&N drop-in, so I tried it. After that no more silt. In fact I never found anything on the carb throat anymore. That made me a believer. I'm also not to concerned about the 3.13% difference in filtration between the AC and the K&N filters. Especially with my Suby which sees alot less dirt then the FJ40 did. I'm more concerned with flow.
It's unfortunate that the K&N's mess with MAP's in WRX's, but I've had a K&N drop-in on my CAI equipped '04 RS for over 35k miles with no problems.
It's unfortunate that the K&N's mess with MAP's in WRX's, but I've had a K&N drop-in on my CAI equipped '04 RS for over 35k miles with no problems.
Oh, I understand. I raced dirt (bikes and cars) and swore by K&N. I have used them in every car I have owned since they have been out, including my Range Rover (with a full Borla exhaust system, no less ~ that's how I roll).
But I had my K&N factory oiled (not a re-oil) cover my MAF with a thin oil layer, which gave me a lean condition and hence detonation at light loads. Cleaned the MAF sensor with electrical contact cleaner ~ threw in the HKS foam drop in and end of problems!
Thread Starter
Registered User
iTrader: (2)
Joined: Feb 2006
Posts: 1,900
From: Baja Oregon
Car Info: '05 Impreza Outback Sport ~ "WTF! Two-Toned?"
Originally Posted by lethal1
Would you happen to have the part number for that hks. I have had hks in all my cars and I wanna keep it that way. I have an 06 2.5i, even though I don't think that should matter.
I don't have it handy... it's the same as the new 350Z. I think I just Googled 'HKS' and found a Suby dealer in SoCal that had them in stock!
This is not where I got it... but it's the same piece!
http://www.racerwheel.com/hks-70017-an001.html
You can PM me and I have an extra one at home (at work right now) and I can read the part # off it as well! This filter list as up to '05 ~ but as far as I can tell (just lifted a hood on an '06 here at work) it's the same unit!
Last edited by NW OBS; Aug 6, 2006 at 11:16 AM.
Registered User
iTrader: (1)
Joined: Jul 2006
Posts: 588
From: MAKAKILO, HI
Car Info: 06 2.5i WGN & 06 WRX WGN
Hks
Put it in this morning, was not expecting results but, I think they are there, definately more sound at WOT. I am a hesitant to think there are gains, but shoot, I think they are there with the HKS...
Thread Starter
Registered User
iTrader: (2)
Joined: Feb 2006
Posts: 1,900
From: Baja Oregon
Car Info: '05 Impreza Outback Sport ~ "WTF! Two-Toned?"
Originally Posted by WRX409
I never had any issues with K/N air filters and I will continue
to use them.
to use them.
Thursday we had our 20th car in 2 years pull into the service bay with another MAF sensor fouled by oil ~ the car wouldn't idle, coughed and bucked... the owner was in a panic, all he could see was $$$ signs.
This was a 'factory oiled' K&N with 5,000 miles on the filter. Cleaned the inside of the intake hose which was coated with film, shot the MAF twice with electrical contact cleaner and dropped in an STI paper. $150 later he was smiling and had an STI again!
I have a K&N with about half a charge kit left... if anyone is still a non-beliver of K&N MAF fouling ~ I'll sell for REAL cheap! I am on the HKS and quite happy with my choice.
Registered User
iTrader: (1)
Joined: Oct 2006
Posts: 8
From: Montreal, Canada
Car Info: Impreza RS 2005
K&N = problems (at least for me)
OK, here's my story: I replaced the filter on my 2005 Impreza RS with a K&N (stock airbox), and after 70km, I got a CEL and blinking Cruise light, poor iddle and weird knocking noises...
Had to clean the sensor with contact cleaner, put an EOM filter and disconnect the battery for these problems to go away.
But the car did feel zippier with the K&N filter, not more powerfull but more responsive.
Had to clean the sensor with contact cleaner, put an EOM filter and disconnect the battery for these problems to go away.
But the car did feel zippier with the K&N filter, not more powerfull but more responsive.
Registered User
Joined: Feb 2006
Posts: 158
From: Hawaii
Car Info: 06 impreza 2.5i
just bought my hks drop in filter. hopefully the seller ships promptly. other than that, one i put it in, i'll let you know my feedback.
... at 2.90 for a gallon of gas, i need to increase my mpg...
... at 2.90 for a gallon of gas, i need to increase my mpg...
Registered User
Joined: May 2006
Posts: 19
From: san jose, ca
Car Info: Subaru
Just put in a K&N for my '02 TS wagon. Hopefully I won't have problems with the MAF sensor like others. I looked at the HKS ones, but it doesn't look like they make one for an NA Subie in my year, only the WRX's. Anybody know of an alternative to the K&N for my car other than the stock paper filter or a FRAM one? I couldn't find any myself, hence the purchase of the K&N.
Tone
Tone
Registered User
Joined: Jan 2007
Posts: 156
From: Southern Colorado
Car Info: 07 impreza 2.5i
70017-AN001 came up as a 300zx filter!? [when i looked up the part number]
edit: i'm a tool! lol. looks like nissan/subaru share the same filter types!
edit: i'm a tool! lol. looks like nissan/subaru share the same filter types!
Last edited by Vizzionz; Mar 23, 2007 at 10:34 PM.
Registered User
Joined: Apr 2006
Posts: 13
From: Pocono's Pa
Car Info: 96 Impreza Brighton Coupe
does anyone here know if that HKS foam filter will fit in the stock air box of a 96 impreza with the 1.8L. I'm pretty sure it does, but I just wanted to confirm before I purchased it
I previously ran a K&N cone filter before the MAF sensor and I noticed that it became clogged with the red oil. I threw the stock air box back in but I want a better filter besides the usual cheapo FRAM.
I previously ran a K&N cone filter before the MAF sensor and I noticed that it became clogged with the red oil. I threw the stock air box back in but I want a better filter besides the usual cheapo FRAM.