First, the gasket prevents oil from going through the filter. While the oil is flowing, the cheap glue on the ends is only needed to keep the folds straight. And it does. A metal cap is not required. K&N claims better flow with fewer restrictions and higher filtration. In general, more wrinkles mean more surface area and more flow. This filter has about β fewer pleats than the Mobile 1 filter. The filter paper could be better, or they just blow smoke, I don't know. Although the oil pressure is not higher. There will be no problem to buy it again.
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