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Old 10-28-2009, 08:27 PM   #1
Bren-Ten
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Default K & N Drop in Filter

Did some searching and didnt find a thread on it.

Anyone have em? significant power gain? gain/loss in fuel economy?

I have an '10 WRX.. worth the 50$ or get a CAI over the summer?
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Old 10-28-2009, 08:33 PM   #2
Chadillac4454
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It's arguable. I didn't notice any difference from stock, later I got a cold air and noticed a little difference.

Check this out
http://forums.nasioc.com/forums/showthread.php?t=477393
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Old 10-28-2009, 08:51 PM   #3
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Thanks man. i think ill do the same thing as you and get the drop in then upgrade down the line
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Old 10-28-2009, 08:54 PM   #4
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wondering the same thing for my soon to be 09' WRX
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Old 10-28-2009, 09:08 PM   #5
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my friend has been considering this for his Lancer anyone know anything?
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Old 10-28-2009, 09:13 PM   #6
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Keep your factory airbox and drop the K&N in there. Until you are at a bigger turbo and FMIC piping is the issue, might as well keep it.
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Old 10-29-2009, 01:23 AM   #7
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I just my K&N drop in filter for my 09 WRX, you can't really notice much of a power gain but there is some. Pick up speed is quicker, also mpg goes up a bit.
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Old 10-29-2009, 10:03 AM   #8
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Quote:
Originally Posted by IcePen View Post
Pick up speed is quicker, also mpg goes up a bit.
what sort of increase did you see in city driving? i get about 19.5 city when i do 2k shifts, what sort of increase can i expect?

Do you hear the turbo spool more and can you hear the intake doing its job when your driving?
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Old 10-29-2009, 10:17 AM   #9
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Any real power gain from a paper filter versus K&N filter is probably just imagination. The real gain might be simply because the old filter was full of dirt, so any new filter would have the same improvement.

I've read the oils in the K&N filters can get onto the MAF sensor and cause an issue. I've always used a stock filter on a car making 50% more power than stock, never a problem.

My old VW used a K&N cone filter and when I put the stock box back on to sell it, the car felt better
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Old 10-29-2009, 10:22 AM   #10
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Quote:
Originally Posted by Bren-Ten View Post
what sort of increase did you see in city driving? i get about 19.5 city when i do 2k shifts, what sort of increase can i expect?

Do you hear the turbo spool more and can you hear the intake doing its job when your driving?
Sorry to OP, cause this is off HIS topic, but I had to reply to this.

You should be shifting higher than 2K RPM, thats too low in the next gear and you're putting unnecessary load on the engine. I dont let my RPMs DROP below 2K RPM, I shift at around 3K. (accelerate very gradual)

If you have a boost / vaccum gauge you can see how much vacuum you have. High vacuum and low RPM will get you better mileage then lower RPM but barley any vacuum or hitting boost.

I have an STI and get better mileage than you... try changing your driving habits first, then pick up parts.

Last edited by SS/GNX; 10-29-2009 at 10:44 AM.
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Old 10-29-2009, 11:04 AM   #11
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You'll notice a performance increase because you want it to make a difference. If you wanted it to make your car slower, your car would feel slower when you drove it.
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Old 10-29-2009, 11:11 AM   #12
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Very slight amount of more whooshies are experienced with the K&N.
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Old 10-29-2009, 11:17 AM   #13
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stickers... thats the key horsepower maker
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Old 10-29-2009, 11:18 AM   #14
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i've got an 08 wrx and i got the hks drop in filter. its a lil cheaper (from rallysportdirect.com) and i noticed a significant difference in throttle response. at least significant to me, i know my car pretty well
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Old 10-29-2009, 11:20 AM   #15
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Quote:
Originally Posted by WC LATHE WERKS View Post
I've read the oils in the K&N filters can get onto the MAF sensor and cause an issue. I've always used a stock filter on a car making 50% more power than stock, never a problem.
I put a K&N in my RS and it ate my front o2 sensor. Oil all over the MAF. so there goes $30 for the filter and $200 or whatever it was for a sensor
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Old 10-29-2009, 11:21 AM   #16
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Do some research. K&N filters are more hype than anything and actually perform worsein the filtration area over the stock OEM filter you can get. They don't add power. I took my out as I didn't like what it was doing to my A/F correction.

I equate K&N to the Monster of audio/video cables. Overpriced crap that does little to help you.
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Old 10-29-2009, 11:32 AM   #17
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monster is great quality and comes with a fantastic warranty... so i dont really understand your analogy.

my .02: get an hks or blitz filter from rallysportdirect.com, they work great its the same thing as k&n pretty much, just the jdm version
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Old 10-29-2009, 11:47 AM   #18
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I had the K&N on my wrx in 2002 because it was recommended for the TXS stg 1 Unichip generic dynamometer tune. It was OK as supplied. When it came to re-oiling it I passed on it. I ditched it because of reports of MAF fouling. I had a really large K&N cone filter on my 300ZX and I did have to buy a new MAF in time, but it was an outright failure and may have had nothing to do with oiling which I did myself several times. I never liked the oiling process; it was not sufficiently quantitative for my tastes.

I use STI (expensive; designated "Off-Road only" filters) on the stg 3 utec wrx 97 octane/up to 22 psi because they maintain high flow a long time. I replace it with a new one before there is any degradation of performance. I have also used cheap stock filters, changed more frequently, so that works too.
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Old 10-29-2009, 11:52 AM   #19
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Quote:
Originally Posted by Momosaurus WRX View Post
monster is great quality and comes with a fantastic warranty... so i dont really understand your analogy.

my .02: get an hks or blitz filter from rallysportdirect.com, they work great its the same thing as k&n pretty much, just the jdm version
ugh....don't buy into the hype of monster....take apart their cables and compare them to the same type of say radio shack cable and then you will see how bad they are. They like to sell you a $60 HDMI cable you can get from monoprice.com for $5 and the $5 is of higher quality. "High end" audio/video cables are the biggest farce in the A/V industry...take it from someone that has spent the last 10 years in audio engineering....
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Old 10-29-2009, 12:06 PM   #20
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Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_1_2 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7D11 Safari/528.16)

K&N filters are fine. Just don't over-oil and make sure the filter is dry when you put it on. You may also want to clean the MAF after re-oiling the filter and driving around a bit.
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Old 10-29-2009, 12:48 PM   #21
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K&N don't filter for crap. Get an Apexi panel filter - it filters as well as OEM and flows as well as a K&N.

Also, Monster cables are overpriced garbage, HKS makes great intakes but terrible filters, and clean your MAF regularly no matter what filter you used - it's one of the most important parts of your engine.
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Old 10-29-2009, 01:55 PM   #22
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I saw a little ricer Honda today with the K&N sticker (the one that says do not replace this filter) on the driver side window! That was a good laugh.
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Old 10-29-2009, 02:05 PM   #23
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my car came with a kn filter so i have no idea the difference...snokus removal!!!
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Old 10-29-2009, 03:01 PM   #24
Bren-Ten
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Quote:
Originally Posted by SS/GNX View Post
Sorry to OP, cause this is off HIS topic, but I had to reply to this.
This is my first car/first manual car. thanks man ill keep this in mind for sure.


thanks to everyone else for their responses. really appreciate it.

From what i just read from you guys im gunna stay away from the K&N drop in. How is Perrins CAI/drop in filter? i just dont want to be doing things that will potentially harm my car
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Old 10-29-2009, 03:15 PM   #25
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it won't harm your car, they're just being a bunch of sissies if you want to save money, go with the drop in filter. no matter what filter you have, you will have to clean your MAF regularly. a CAI or a ram intake won't do you much difference if your car is stock. hence why i wouldn't bother with it yet. get an exhaust then come back to getting a better intake

also, idk about other 08+ wrx's, but my didn't have a snorkus. where it should have attached to the airbox there was a solid piece of plastic covering it.

and as for cables... i buy mogami cables not monster cables. but i would pay extra just for the warranty vs. buying radio shack cables. i have used radio shack cables and monster cables, AND if you have the same experience that i do with sound and sound engineering, then you would go with monster over radio shack and other no name brands. monster cables produce a pretty DAMN clear sound. mogami is more expensive than monster, but thats cuz they produce an even clearer sound
/end rant
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