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Old 05-10-2003, 01:08 AM   #1
Scooby Specialist
Member#: 12863
Join Date: Nov 2001
Chapter/Region: MWSOC
2002 2.5RS

Default Amsoil vs. K&N

Which is the better of the two. I did a search and to my surprise didn't find much info at all.

Which has the best performance with the safest and most reliable filtering capabilities. I still worry that some contaminant will pass through a non stock air filter.

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Old 05-10-2003, 09:46 AM   #2
Scooby Specialist
Member#: 13486
Join Date: Dec 2001
Chapter/Region: W. Canada
Location: Calgary
06 Legacy GT wagon


I think the Amsoil might filter better, but just maybe the K&N might flow better, despite Amsoils claim to be better at everything. I have the Amsoil with PDM intake on my 2002 OBS, and a friend has an identical setup, except for K&N. The sound from his was a more audible whooshing hiss if he blipped the throttle from idle. Mine sounds more dampened or muffled. Could be that the thick Amsoil foam dampens the sound better is all, without affecting flow.

The Amsoil definitely filters effectively. I bought it in December and just washed it, after a winter of several muddy rallycrosses and a rallyschool. There was a noticeable spatter of mud where I ingested water to the filter, but all clean on the other side. Much better power now with a clean filter, so it definitely did what it was supposed to.

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Old 05-10-2003, 10:43 PM   #3
Scooby Newbie
Member#: 32241
Join Date: Jan 2003
Chapter/Region: South East
Location: Morristown, TN 37813
1998 Impreza L Coupe


Just put an Amsoil on my 98 L Coupe with 2.2 engine. Am disappointed with Amsoil's quality compared to K & N. The Amsoil filter flange that seals the filter to the housing is thin foam and arrived bent and distorted. I hope I got it in correctly and that it is not bypassing dirty air. K & N filters with their OEM type rubber sealing flange do not have this problem.
My 2 cents,
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