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Subwoofer installed : r/BMWi3
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Audison Prima for BMW i3 | Amazing audio Upgrade for BMW i3 using Prima speakers for BMW🎵, Prima Subwoofer with Kevlar custom box 🔝 and AP5.9 bit processor👏made by French... | By
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Installed a subwoofer in the trunk : r/BMWi3
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2014-2022 BMW i3
Building custom hidden sub box for BMW i3 | DIYMobileAudio.com Car Stereo Forum
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First upgrade to my (new to me) 2018 i3 REX - Active Subwoofer Installed! : r/BMWi3
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2014-2022 BMW i3
Actual Subwoofer - BMW i3 Forum
