JL Audio Stealthbox® Custom-fit fiberglass enclosure with 10" W1v3 subwoofer — fits 2011-up Volkswagen Jetta sedan at Crutchfield
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 :
Basser - FBvw07 VW Jetta 5 Sedan Fit-Box subwoofer enclosure
OEM Rear Woofer Sackbut Back Door Subwoofer Speaker for VW Golf 6 MK6 Jetta 5KD 035 454 _ - AliExpress Mobile