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Upgrading Audi A3 OEM Subwoofer with aftermarket 8" JBL woofer and DS18 Candy Amp in stock location. - YouTube
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For Audi A3 8P 3-türer Subwoofer Housing for 20 CM 8 Inch Woofer Space-Saving 4047442079399 | eBay
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FBaudi02 Audi A3 8P Fit-Box subwoofer enclosure
2006 - 2012 AUDI A3 Bose Speaker set w Subwoofer 8P4035382A OEM | eBay