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I guess I'm a little puzzled about some of this. So maybe that magazine article did not use a decent test design (I didn't read it, so can't really comment) but why would you expect that sort of magazine to do so? After all, they're hardly a peer-reviewed scientific journal.
As for the claims about K&N improving mpg and/or performance, have any of you actually done the testing you're talking about, or are you just spouting your own opinions?
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