I like K&N for the re-usability, improved sound and improved air flow. I never over oil them. I've not tried some of the other solutions discussed here, though.
I have to say the the stock filters were better than most. And the intake system is well designed for a stock set up. Obviously, others have improved on it. But compared to most of the restrictive systems on other cars, the Z's is a breath of fresh air (that's an intake joke, by the way).
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Rain, snow, sleet, hail: 2009 Mazda 3 sGT HB
Everything else: 2009 370z, PW Touring 6MT
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