M.A.P Audio & Customs - Custom made fiberglass 8" subwoofer enclosure for an audi a3 8v. This was hand made with mdf rings and support braces. It was then fiberglass and covered
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Amazon.com: Compatible with Audi A3 2006-2010 Factory Speaker Replacement Harmony Coax (2) R65 Package New : Electronics
A3 B&O sub woofer | Audi-Sport.net
Upgrading Audi A3 OEM Subwoofer with aftermarket 8" JBL woofer and DS18 Candy Amp in stock location. - YouTube
FBaudi01 Audi A3 8L Fit-Box subwoofer enclosure
For Audi A3 8PA Subwoofer Housing 20 CM 8 Inch Woofer Space-Saving Boot | eBay