The cabin filter was approximately 1.5mm shorter measured from the felt sides and was not made with felt sides like the OEM filter. This created small gaps on each side of the filter when it was inserted into the filter holder. These gaps allowed unfiltered air to flow past the filter. The lack of felt sides also prevented the compression pad from "sealing" the sides of the filter when inserted into the holder. AC Delco is a reliable company but this seemingly minor oversight results in this particular filter being underrated and therefore unacceptable.
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