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Tim you were not kidding. I am more than pleased with this upgrade. Motor sounds and feels stronger even in the mid-range. After looking at the removed US stock filter, I can't see how there was any kind of airflow through the multiple layers. You can tell it's much thicker and heavier than the AFE. I bet the filter change will become the step one upgrade on the M3 much like the charcoal filter removal is on M5s/M6s.
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