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![Ported Custom Sub Enclosure Box for 1 18" Skar Audio ZVX-18 Subwoofer - 5.25 CF | eBay](https://i.ebayimg.com/images/g/BYcAAOSwHQBjb7CY/s-l1600.png "Ported Custom Sub Enclosure Box for 1 18" Skar Audio ZVX-18 Subwoofer - 5.25 CF | eBay")