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Good, Bad & Ugly Air Filters and Induction Kits

Old 17 October 2018, 05:03 PM
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Brian Powell
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Question Good, Bad & Ugly Air Filters and Induction Kits

Hi guys, hope all is well!

Currently doing some research on modifications for my Impreza WRX GDA 2.0 MY05.

I'm wondering what experiences and thoughts you guys have about certain brands / models.

I've been looking at these brands:What are you guys thoughts?
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Old 17 October 2018, 05:36 PM
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the shreksta
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from what ive gathered on this forum is......

stay away from the hks mushroom induction kit

any decent panel filter will be ok

if you must have an induction kit then stick with either k&n, rcm, perrin or aps

i wouldnt have any mishimoto part on my car even if it was free...............
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Old 17 October 2018, 06:18 PM
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I picked up the Perrin Black CAI from scoobyclinic when they were clearing stock. got a steak at 200 as they are normally 300. Quality is very good although still not fitted as waiting to get it powdercoated
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Old 17 October 2018, 06:35 PM
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Bryan Gallacher
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I installed a cosworth short ram high flow kit on my 05 blobeye and saw gains of 15bhp along with an upgrade from 2.5 to 3" centre section. slight improvement in throttle response although that will be down to the map tweak from Andy forrest. Sounds ****in brilliant though

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Old 17 October 2018, 06:37 PM
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Originally Posted by Bryan Gallacher View Post
I installed a cosworth short ram high flow kit on my 05 blobeye and saw gains of 15bhp along with an upgrade from 2.5 to 3" centre section. slight improvement in throttle response although that will be down to the map tweak from Andy forrest. Sounds ****in brilliant though
ah yes i forgot about the cosworth one, another quality item.
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Old 17 October 2018, 06:43 PM
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Jon T
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Originally Posted by hackisfun View Post
I picked up the Perrin Black CAI from scoobyclinic when they were clearing stock. got a steak at 200 as they are normally 300. Quality is very good although still not fitted as waiting to get it powdercoated
I also have the perrin one can't fault it. Makes a hell of a nice noise
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Old 17 October 2018, 06:53 PM
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I'm a big fan of the rcm induction kits, developed specifically for the Impreza and gives an awesome whooshing sound when on boost
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Old 17 October 2018, 07:26 PM
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Originally Posted by the shreksta View Post
I'm a big fan of the rcm induction kits, developed specifically for the Impreza and gives an awesome whooshing sound when on boost
Can the same be said for the cosworth one?
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Old 17 October 2018, 07:30 PM
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Originally Posted by the shreksta View Post
I'm a big fan of the rcm induction kits, developed specifically for the Impreza and gives an awesome whooshing sound when on boost

Been running RCM induction kit on most of my cars for donkeys years now...their "QUALITY".SJ.
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Old 17 October 2018, 07:44 PM
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Originally Posted by stonejedi View Post

Been running RCM induction kit on most of my cars for donkeys years now...their "QUALITY".SJ.
good lad
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Old 17 October 2018, 07:48 PM
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Does the rcm kit still use a K&N cone filter?
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Old 17 October 2018, 07:59 PM
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Originally Posted by Bryan Gallacher View Post
Does the rcm kit still use a K&N cone filter?
Yes
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Old 17 October 2018, 08:03 PM
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Originally Posted by Jon T View Post
Yes

Does that mean it's a perishable item? ie you'll need to maintain or change the filter at some point throughout it's shelf life ?
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Old 17 October 2018, 08:07 PM
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Yes. You can buy a k+n filter cleaner kit that comes with a cleaner and new oil.
​​​​​Any filter will need cleaning as part of regular maintenance.When the time comes I'm going to buy a second filter so I can just swap it then clean the one I took off

Last edited by Jon T; 17 October 2018 at 08:09 PM.
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Old 18 October 2018, 11:00 AM
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It's not on this list, but I opted for the Japspeed piece on my Hawk STi in end. After a good amount of research I couldn't really see the reason for the price of the other options. You can use some K&N oil on it, should you want to it doesn't need it, or even replace their cone filter with another piece (K&N cones are ~30 on ebay).

I can't really quantify the hp increase (as I road tune the car myself), but I definitely did see an increase in air flow at the top end, more air = more power - but really it's about the noise

So in summary you could buy the following and save a fortune:

- japspeed induction kit for the pipework only (if really bothered throw away their filter), from ebay
- K&N cone + oil, from ebay

worth considering I'd say. Or just stick to the japspeed cone as I have, and save even more!

Last edited by Bazil_SW; 18 October 2018 at 11:18 AM.
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Old 18 October 2018, 11:05 AM
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Using an oil based filter will wreck your maf. I have a uprated air filter on mine.
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Old 18 October 2018, 11:19 AM
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is it only induction kits using the K&N that are oiled?

Thinking about getting the Cosworth one when I do a remap.
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Old 18 October 2018, 01:27 PM
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Get an AEM Dryflow filter. No need to use oiled filters.
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Old 18 October 2018, 05:46 PM
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No some panel filters are oiled aswell.


Originally Posted by Rusti
is it only induction kits using the K&N that are oiled?

Thinking about getting the Cosworth one when I do a remap.
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Old 18 October 2018, 05:51 PM
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To be fair I've been using K&N oiled panel filters for years on Subaru's and haven't had a maf issue to date, but have heard excessive oil can do this. You can clean and re-oil the K&N filters yourself with K&N cleaning and re-oiling kits. Maybe the damage reported is when someone over-oils them?
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Old 18 October 2018, 06:29 PM
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Do luck filters come out good on dyno tests but are drenched in oil.

https://www.scoobynet.com/general-te...s-morning.html
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Old 18 October 2018, 07:17 PM
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Originally Posted by [email protected] View Post
Do luck filters come out good on dyno tests but are drenched in oil.

https://www.scoobynet.com/general-te...s-morning.html
Have you ever looked at a Do Luck filter? I bought one year's ago based on the dyno results, but they really are poorly made. They only made good results because they were less restrictive and letting more harmful particles through.

Honestly, they are quite poor. I threw mine in the bin and have used either K&N or Cosworth ever since.
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Old 18 October 2018, 07:40 PM
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Originally Posted by BrownPantsRacing View Post
To be fair I've been using K&N oiled panel filters for years on Subaru's and haven't had a maf issue to date, but have heard excessive oil can do this. You can clean and re-oil the K&N filters yourself with K&N cleaning and re-oiling kits. Maybe the damage reported is when someone over-oils them?
Agreed that this is the likely cause. Certainly that's what happened to me when I ran a k&n oiled panel filter!

However you can clean the MAF with switch cleaner if it does happen.
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Old 19 October 2018, 09:58 AM
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have always found the main issue is with FOAM oiled filters........the likes of K&N cotton gauze type, when correctly oiled, are no problem
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Old 19 October 2018, 12:03 PM
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Originally Posted by stockcar View Post
have always found the main issue is with FOAM oiled filters........the likes of K&N cotton gauze type, when correctly oiled, are no problem
I have come to the same conclusion myself.SJ.
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Old 19 October 2018, 02:21 PM
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Yes and didn't even remove from packaging just got rid when I saw the amount of oil it was soaked in.


Originally Posted by BrownPantsRacing
Have you ever looked at a Do Luck filter? I bought one year's ago based on the dyno results, but they really are poorly made. They only made good results because they were less restrictive and letting more harmful particles through.

Honestly, they are quite poor. I threw mine in the bin and have used either K&N or Cosworth ever since.
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