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First upgrade to my (new to me) 2018 i3 REX - Active Subwoofer Installed! : r/BMWi3
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Ford Focus Sub and amp install - YouTube
DIY Amp/Sub Install, with minimal impact to factory equipment. | Ford Focus RS Forum
2012-2018 Ford Focus - Custom 500W RMS 10" Loaded Subwoofer Enclosure — NVX
ST1 Sub Install | Ford Focus ST Forum
2012-2018 Ford Focus - Custom 500W RMS 10" Loaded Subwoofer Enclosure — NVX
Remote wire install for Amp : r/FordFocus
