K&N air filters are NOT A BENEFICIAL MOD!
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Joined: Feb 2006
Posts: 1,900
From: Baja Oregon
Car Info: '05 Impreza Outback Sport ~ "WTF! Two-Toned?"
Originally Posted by testes1010
The stock air box IS a CAI.
My reasoning for why a CAI > SRI is because the IAT(Inlet Air Temp Sensor) in the MAF is one of the factors for adjusting/advancing timing. Colder air more timing. (Although its a ****-poor location for it, it should be in the Throttle body after the IC or have 2 for calculating turbo/ic efficiency.)
Note: No aftermarket CAI or SRI is good for a stock WRX.
First off I did read the whole acticle. This one chart (attached), at least how I read it, conterdicts what you say about the K&N flow being the worst.
I read this as Restriction, In. of H20 across the filter(Actual pressure drop across the filter) as CFM increases. This chart alone shows that the K&N flows the best. I may have misinterpreted it but thats how I read it.
Jeremy
My reasoning for why a CAI > SRI is because the IAT(Inlet Air Temp Sensor) in the MAF is one of the factors for adjusting/advancing timing. Colder air more timing. (Although its a ****-poor location for it, it should be in the Throttle body after the IC or have 2 for calculating turbo/ic efficiency.)
Note: No aftermarket CAI or SRI is good for a stock WRX.
First off I did read the whole acticle. This one chart (attached), at least how I read it, conterdicts what you say about the K&N flow being the worst.
I read this as Restriction, In. of H20 across the filter(Actual pressure drop across the filter) as CFM increases. This chart alone shows that the K&N flows the best. I may have misinterpreted it but thats how I read it.
Jeremy
Makes sense, everything is a trade off.
I got sick of the debate and bought an HKS three layer foam drop in ~ at least there is no oil...
Oh, and after running a Green an STI (SPT Version) and a K&N... the HKS was the only one I could feel ANY difference with. Better throttle response and easier revving high in the range (above 4 grand) then the others. This was with my mechanic riding and driving the car with each filter as a second opinion.
im happy with my STi filter, personally i think its better than my stupid airhog and it filters better too... i think im gonna buy the HKS just to test it out to see if i like it..its only like $35
atleast the good thing with air filters are that its really easy to switch out and make runs with different ones
atleast the good thing with air filters are that its really easy to switch out and make runs with different ones
yeah, its not oiled, however i believe it still leans out the air/fuel ratio, so youd have to get a custom tune
drop ins are the way to go, and i say stick with the STi filter element
drop ins are the way to go, and i say stick with the STi filter element
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Joined: Feb 2003
Posts: 488
From: 12.9 / 105+
Car Info: black my03 5mt wrx s/w
remember ALL filters actually filter BETTER (ie trap smaller diameter particulate matter) as they age.
i have run a k+n on my car since the month after i bought it. i resist the urge to overclean it, due to the above point. as a result i clean it once a year.
a good friend of mine picked up 1mph in a 1320 by removing an oem wrx air filter element entirely from the box. i have no corresponding data for any other filter though.
i have run a k+n on my car since the month after i bought it. i resist the urge to overclean it, due to the above point. as a result i clean it once a year.
a good friend of mine picked up 1mph in a 1320 by removing an oem wrx air filter element entirely from the box. i have no corresponding data for any other filter though.
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Joined: Jul 2005
Posts: 147
From: The Wild Serengeti Suburbs of MAIC
Car Info: '08 WRB SG model D
Originally Posted by Cody8675309
The quote that really took me by surprise was this:
"Compared to the AC, the K&N “plugged up” nearly 3 times faster, passed 18 times more dirt and captured 37% less dirt."
"Compared to the AC, the K&N “plugged up” nearly 3 times faster, passed 18 times more dirt and captured 37% less dirt."
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