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I used to run a K&N in the stock housing. Didn't seal well and so didn't filter well. I went back using OE MB air filters. They seal perfectly. If I were you, I would rotate them 90 degrees every 3000 miles and replace them after a full rotation (12K miles).
Our air filter housings like to concentrate oil and dirt in small sections of the air filter - this technique ensures that filtration and airflow are always optimal.
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