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Official answer: I don't know.
What I think - it might help down low with creating a sort of restriction/creating turbulence but that will hurt high RPM power gains, especially if you have other mods.
Some people think they help, others don't. My opinion is that I don't want anything restricting air going into the motor and that includes ridges or any other type of protrusion into the air stream with the exception of the nitrous nozzle for obvious reasons. You have to bear in mind that no two vehicles are the same and it is ultimately the combination of parts that make any difference and not just one that bolts on.
Your mileage may vary.
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1/4 - 13.74@98.2 1/8 - 8.79@80.2 (04 CC - it's gone now)
1/4 - 12.23@115.8 with the 06 Forester
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