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
Easy B+O Subwoofer Install How-To w/ Photos +Signal Analysis | Audi TT Forum
2017 Audi A3 Build Log | DIYMobileAudio.com Car Stereo Forum
AUDI A3 8V 2013 - Install Subwoofer - YouTube
Audi A3 - Custom Stealth Sub Install (Pictures Included) - AudiForums.com