Per Audi A3 8PA Subwoofer Alloggiamento 20 CM 8 Pollici Woofer Salvaspazio Avvio | eBay
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