Smaller than standard. Don't buy the Outback 2015! The filter is about 5mm shorter than it should be. This results in a loose fit in the air cell. Who knows how many particles will get past this filter in a standard airbox. replaced it with autozone's STP Premium and it fits properly and fits snugly in the airbox. I have attached photos showing the filter is shorter than it should be. The bottom filter in the stack is STP Premium, the top filter is EPAuto.
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