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The comparison was in TPR i think, or Dsport. One of the early issues. Just be carefull with an oiled filter (k&n). They can be fine but the oil can seep out of the element and contaminate MAFS. Also if you forget to re-oil, parts that were exposed to oil and then dried out later, can start to crumble. But if maintained properly, k&n is just fine.
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