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I'm running the K&N drop in filter. I can't tell of any performance gains, but I am noticing that I can get about 320 miles per tank of gas. And yes I vtec at least 3 times a day.
I've had my K & N drop-in filter for about three months and ~2000 miles.
No perceptable difference in power, but gas mileage has increased by about 2 mpg.
No other power mods.