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133 Posts
Discussion Starter #1
I did some research on some other forums, and found that the new Fram Airhog seems to be equal/better filter than the K&N panel filter.

Part number PPA4309 fits just fine in the STI, even though the fitment guide published by Fram doesn't list one for the STI.

After removing the silencer and installing the Airhog, I went for a ride. I had the windows down, the intake wasn't noticably louder, however, you can actually hear the DV.

I rolled the windows up, and I was really surprised at how well you can hear the DV, the intake whoosh, and the turbo whine.

Music to my ears.

As far as any gains? Haven't really driven enough to tell, and, with our ECU mood swings, I don't know if I'll ever be able to tell...
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