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I used a K&N 63 series cold air intake and had the same problem. Check engine light; Too lean code. Tried cleaning the mass air sensor, resetting the computer, pulling fuses #5 and #20, reinstalling the intake, etc. and nothing solved the problem. So I called K&N customer service and spoke with a gentleman named Troy. He explained that they had been having that problem with the 63 series filters and offerred to swap out the whole intake for the K&N 69 series Typhoon air intake for free. He sent the new one by 2 day air as a courtesy. I installed it about a week ago and the check engine light hasn't come back. Great customer service. Highly recommend
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