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 2003 Onwards JL Audio 8" 150 Watts Car Subwoofer Custom Bass Box Kit
Amazon.com: Compatible with Audi A3 2006-2010 Factory Speaker Replacement Harmony Coax (2) R65 Package New : Electronics
Audi A3 - Custom Stealth Sub Install (Pictures Included) - AudiForums.com
Gallery - Audi A3 SQL Install - ESSEX
JL Audio 8W3V3-4 | 250W RMS 8" Single 4 Ohm Car Subwoofer
3 12" NXS subs in Audi A3 | Car audio installation, Car audio systems, Car audio
Alpine - SPC-300A3 Premium Alpine Sound System for Audi A3, S3, RS3