Audi A3 - Custom Stealth Sub Install (Pictures Included) - AudiForums.com
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
Audi A3 8V Subwoofer Soundsystem GFK | CarHifi-Berlin
Ballwin Client Audi S3 Audio Upgrade Stage 1: Bass