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Daox - regarding the test article. The Metro, as the Yaris - is small engines. When operated at low rpm's you would se little or no difference to an K&N filter. In dry conditions that is!
Had the guy performed the same test in raini wheater, the K&N would have come out better, as the appaer sucks up moisture and swells, thus blocking som of the airflow and letting through less air.
In a country as for instance the UK, whith a lot of damp wheather, this is well known.
But as stated else where, on small engines effect of the K&N are small, but its still a filter you can have for the lifetime of your car, which is why i put in the Yaris.
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