View Poll Results: HKS or Pipercross air filter
HKS
16
76.19%
Pipercross
5
23.81%
Voters: 21. You may not vote on this poll
HKS or Pipercorss
26 August 2013, 11:44 AM
#1
HKS or Pipercorss
I've ended up buying a HKS and pipercross filter and can't decide which to fit, anyone tried both? The Pipercross looks more a conventional filter where the HKS is more a foam like filter
Last edited by jaygsi; 07 September 2013 at 05:00 PM.
26 August 2013, 12:05 PM
#2
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I've got a Pro R one that's done about 10 miles (no joke) up for grabs if you'd like to add it to your collection!
Nothing wrong with it, but it just wasn't for me that's all.
It's for an 07 STi, so may fit?
Nothing wrong with it, but it just wasn't for me that's all.
It's for an 07 STi, so may fit?
26 August 2013, 12:26 PM
#3
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I have the HKS filter fitted and the car performs fine. Having said that, I have noticed that the HKS filters don't do well in filtration tests. I'm not sure about the Pipercross filters.
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29 August 2013, 05:11 PM
#12
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I cant see the pics at work, but i dont like foam filters as they degrade and break up.
i have no experience of the HKS mushroom filters, but i did have a pipercross viper i think it was some years ago, that was fully enclosed in a carbon body, and the foam inside did indeed break down and i can only guess got sucked into the engine and the car ate it lol...
that was on an NA car tho, so no turbo to damage.
personally i only buy cotton filters, like K&N
i have no experience of the HKS mushroom filters, but i did have a pipercross viper i think it was some years ago, that was fully enclosed in a carbon body, and the foam inside did indeed break down and i can only guess got sucked into the engine and the car ate it lol...
that was on an NA car tho, so no turbo to damage.
personally i only buy cotton filters, like K&N
30 August 2013, 12:50 PM
#19
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In all honesty, you will see may be 1hp difference if any, so I wouldn't worry. The HKS does have poor filtration test results though. Stick with a standard one and ave yourself some fuel money! 
Last edited by Gear Head; 30 August 2013 at 12:51 PM.
30 August 2013, 02:56 PM
#22
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Is a filter in a hot engine bay more effective than one fed by cold air from the front grill?
30 August 2013, 08:32 PM
#28
The search button is your friend.
As I said, every impreza ecu is mappable, some just require a different route
Last edited by MattyB1983; 30 August 2013 at 08:39 PM.