I'm not sure 20-30 minutes is enough of a cool off period because the car would still be nice and warm at that point. If you reversed the order and went cold on the K&N and waited 20-30 mins and did the paper I think the results would favor the first runner. The K&N should not be 9.1 rwhp lower at the third pass that's obviously something else not air flow because it's first pass was higher then the papers lower two passes after it was warm. I could be wrong but that's my 2 cents.

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