JL Audio Stealthbox® (Solid dark gray) Custom-fit fiberglass enclosure with 10" W3v3 subwoofer Fits 1998-2005 Volkswagen Passat B5 and B5.5 at Crutchfield
Ersatzradmulden Subwoofer im Passat B8 | Ceres Webshop
Amazon.com: Car Stereo with Wireless Carplay Android Auto 7 Inch Touchscreen Bluetooth Car Radio for VW Jetta Golf Tiguan Passat Skoda, Fast Charging, Subwoofer, WiFi, GPS Navigation, SWC, Backup Camera 2+32GB :
Amazon.com: Add A Bass Subwoofer Amplifier Adapter Interface w/Amp Remote Wire to Factory OEM Car Stereo Radio for select VW Made for Jetta Golf CC Passat EOS Tiguan etc- Vehicles listed below :
Volkswagen Soundbox Bluetooth Subwoofer | VW Service and Parts
Installing a Subwoofer into a Passat Estate! - YouTube