In contrast to my previous post of two XG3387A that had the newer non-wire backed filters, here's two original Ultras with the wire. It's quite obvious the wire adds a lot of rigidity to the pleats staying straight.
Previous post: https://bobistheoilguy.com/forums/threads/two-xg3387a-c-p.377204/#post-6725438
Filter 1
Previous post: https://bobistheoilguy.com/forums/threads/two-xg3387a-c-p.377204/#post-6725438
Filter 1
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