A Company in Germany did this custom work in a VW Golf. It features 3-way Morel Virtus speakers, Morel Ultimo… | Car audio, Custom car audio, Car audio installation
MDF closed subwoofer enclosure for VW Golf 3 | eBay
Golf 3 Ver.1
Install JBL SET STAGE3 on vw golf mk3 | VW GOLF MK 3 | [4K] - YouTube
FS: Fiberglass 12" Sub Box for MK3 Golf Wheel Well | VW Vortex - Volkswagen Forum