Review on ECOGARD XC16108 Premium Cabin Air Filter: Perfect Fit for Nissan Altima, Pathfinder, Infiniti QX4, G20 - 1998-2004 by Maurice Strawther

Base filter with low air restriction. It's a perfect fit and excellent value for money. Ironically, the airflow direction arrow on this filter is meaningless and should never have been printed on the filter. There is absolutely no difference between one side of the filter media and the other. The filter media does not have the required or designed airflow direction to be more or less efficient, and the frame is not designed so that airflow direction makes a difference. Ignore the arrow. For my Pathfinder, it's pointing the wrong way. The one way arrow may apply to other vehicles but that doesn't matter either as there is only one way to properly install these filters in any vehicle they are designed for. I've seen this one-way dart on other aftermarket brands as well, but not the Nissan OEM brand.