I tried putting one on my car. The K&N book lists a circular filter for my car. Maybe if I pulled the airbox off I could manage a cone, but not circular. Then, the one theat they listed as an equivalent for the STP/Fram filters was too big. Didn't fit, couldn't make it fit. I have a paper filter in there now.
As for the power gains, the 10+ can happen if you have a cold air intake. Nice thought, but I'll take the 48 bucks.
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